issue #2243 -- prefer f-strings over %-interpolation

edited docs to prefer f-strings, then str.format(), and remove %-interpolation

additional ad-hoc documentation fixes, as opportunities seen:
- replace Built-In Function (BIF) "min" variable with "mins"
- prefer BIF str(var) over "%s" % var
- reformat some code examples to clarify multiple args passed to functions
- change some single-quote strings to double-quotes for consistency
- fix mismatched parens

misc edits:
- add .vscode/ to gitignore

docs/source/Components/Batch-Code-Processor.md

@@ -91,13 +91,12 @@ Below is a version of the example file found in `evennia/contrib/tutorial_exampl
     table = create_object(Object, key="Blue Table", location=limbo)
     chair = create_object(Object, key="Blue Chair", location=limbo)
     
-    string = "A %s and %s were created."
+    string = f"A {table} and {chair} were created."
     if DEBUG:
         table.delete()
         chair.delete()
-        string += " Since debug was active, " \
-             "they were deleted again." 
-    caller.msg(string % (table, chair))
+        string += " Since debug was active, they were deleted again." 
+    caller.msg(string)
 ```
 
 This uses Evennia's Python API to create three objects in sequence. 

docs/source/Components/Commands.md

@@ -65,7 +65,7 @@ Here is a minimalistic command with no custom parsing:
 
         def func(self):
             # echo the caller's input back to the caller
-            self.caller.msg("Echo: {}".format(self.args)
+            self.caller.msg(f"Echo: {self.args}")
 
 ```
 
@@ -548,7 +548,7 @@ class CmdTestID(Command):
             self.xval = 0
         self.xval += 1
 
-        self.caller.msg("Command memory ID: {} (xval={})".format(id(self), self.xval))
+        self.caller.msg(f"Command memory ID: {id(self)} (xval={self.xval})")
 
 ```
 
@@ -651,7 +651,7 @@ thus do so asynchronously, using callbacks.
 ```python
      # in command class func()
      def callback(ret, caller):
-        caller.msg("Returned is %s" % ret)
+        caller.msg(f"Returned is {ret}")
      deferred = self.execute_command("longrunning")
      deferred.addCallback(callback, self.caller)
 ```

docs/source/Components/EvEditor.md

@@ -58,7 +58,7 @@ class CmdSetTestAttr(Command):
         def quit(caller):
             "Since we define it, we must handle messages"
             caller.msg("Editor exited")
-        key = "%s/test" % self.caller
+        key = f"{self.caller}/test"
         # launch the editor
         eveditor.EvEditor(self.caller, 
                           loadfunc=load, savefunc=save, quitfunc=quit, 
@@ -100,7 +100,7 @@ class CmdSetTestAttr(Command):
     key = "settestattr"
     def func(self):
         "Set up the callbacks and launch the editor"
-        key = "%s/test" % self.caller
+        key = f"{self.caller}/test"
         # launch the editor
         eveditor.EvEditor(self.caller, 
                           loadfunc=load, savefunc=save, quitfunc=quit, 

docs/source/Components/EvMenu.md

@@ -531,10 +531,10 @@ def _set_attribute(caller, raw_string, **kwargs):
 
 def node_background(caller):
     text = \
-    """
-    {} experienced a traumatic event
+    f"""
+    {caller.key} experienced a traumatic event
     in their childhood. What was it?
-    """.format(caller.key}
+    """
 
     options = ({"key": "death",
                 "desc": "A violent death in the family",
@@ -580,7 +580,7 @@ def _set_name(caller, raw_string, **kwargs):
         # a blank input either means OK or Abort
         if prev_entry:
             caller.key = prev_entry
-            caller.msg("Set name to {}.".format(prev_entry))
+            caller.msg(f"Set name to {prev_entry}.")
             return "node_background"
         else:
 	    caller.msg("Aborted.")
@@ -644,7 +644,7 @@ def _set_name(caller, raw_string, **kwargs):
 
     caller.ndb._menutree.charactersheet = {}
     caller.ndb._menutree.charactersheet['name'] = raw_string
-    caller.msg("You set your name to {}".format(raw_string)
+    caller.msg(f"You set your name to {raw_string}")
     return "background"
 
 def node_set_name(caller):
@@ -658,7 +658,7 @@ def node_set_name(caller):
 
 
 def node_view_sheet(caller):
-    text = "Character sheet:\n {}".format(self.ndb._menutree.charactersheet)
+    text = f"Character sheet:\n {self.ndb._menutree.charactersheet}"
 
     options = ({"key": "Accept",
                 "goto": "finish_chargen"},

docs/source/Components/Locks.md

@@ -190,7 +190,7 @@ The above could for example be used in a lock function like this:
 
 ```python
     # we have `obj` and `owner_object` from before
-    obj.locks.add("edit: id(%i)" % owner_object.id)
+    obj.locks.add(f"edit: id({owner_object.id})")
 ```
 
 We could check if the "edit" lock is passed with something like this:

docs/source/Components/MonitorHandler.md

@@ -50,9 +50,7 @@ def _monitor_callback(fieldname="", obj=None, **kwargs):
         new_value = getattr(obj, fieldname)
     else: # an attribute    
         new_value = obj.attributes.get(fieldname)
-
-    obj.msg("%s.%s changed to '%s'." % \
-                  (obj.key, fieldname, new_value))
+    obj.msg(f"{obj.key}.{fieldname} changed to '{new_value}'.")
 
 # (we could add _some_other_monitor_callback here too)
 

docs/source/Components/Prototypes.md

@@ -176,7 +176,7 @@ def red(*args, **kwargs):
    """
    if not args or len(args) > 1:
       raise ValueError("Must have one argument, the text to color red!")
-   return "|r{}|n".format(args[0])
+   return f"|r{args[0]}|n"
 ```
 
 > Note that we must make sure to validate input and raise `ValueError` if that fails. Also, it is