Make some more Tile stuff public.

[UPDATED]   checkContents is now @Authenticated as well as any methods that use it.
[UPDATED]   neighbour* is now public.
[ADDED]     checkContents and checkAccessible are public variants of their private counterparts.
[UPDATED]   isAccessible is now unchecked.
Make Tile access more public in Level.

[UPDATED]   Level.getTile* now public.
Added IDEA project & fixed setReady for keyed players.

[ADDED]     IDEA project configuration.
[FIXED]     Fixed issue where keyed players could no longer set themselves ready.
[ADDED]     Omicron WIKI as a submodule.
Merge branch 'master' of github.com:Lyndir/Omnicron

Conflicts:
	.idea/codeStyleSettings.xml