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/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,