Made utils.variable_from_module more generic (it can now load pretty much any form of module it's given and also supports searching and returning multiple variables).
Removed the variable-load functionality from utils.load_module; this is now purely a loader - use variable_from_module instead.
I found out that one couldn't import from src.commands.default due to the __init__ file being restrictive for the sake of the ev API. Removed that and instead imported the default commands into ev.py with the help of utils.variable_from_module instead. Some more fixes in ev followed on this.
As part of this work, I have also written full listings of all available properties on Typeclassed objects (including those inherited in various ways). Should hopefully make things easier to find.
One can of course still import things directly from src/ as before. But this is a first step towards removing the "base" objects in game/gamesrc and instead making those accessible through the core API.
