Fixed possible confusion.
If a command handler gets an error then the player will receive an unknown command error. This can be confusing for players.
HandleCommand now returns an CommandResult enum.
Added crBlocked and crNoPermission
(Force)ExecuteCommand returns the CommandResult enums
Exported and documented the CommandResult enums
Added the Lua Proxy DLL.

This builds the lua5.1.dll file on Windows, making it 64-bit if so required.
Added a missing endline.
Fixed doxycomments
Properly implemented enderchests
Removed bad comment
Unnecessary return
Add new hook: HOOK_PLAYER_FOOD_LEVEL_CHANGE
Add documentation.
Removed unneeded code
Fixes.
Fix server-crash with non-existing items.
Merge branch 'master' into LuaProxy
LuaProxy compilation under MinGW.
Change documentation
Only fixes the server crash.
Merge pull request #1141 from Howaner/GlobalFixes

Fix server-crash with non-existing items.