Resolutions reference file
Update Minimum supported resolution

now 1280 x 720, instead of 1024 x 768,
Add thread safety for FontIds and TextureIds

Add a mutex to FontManager and TextureManager. (Not sure if it'll be
used or not, but whatever.)
ICutlassMovable, and SceneObjectId

- Add new class/interface for Movement (still WIP)
- Objects in SceneObjectManager are now stored in a dictionary, instead
of list. Should decrease lookup time, and make it no longer necessary to
do as many list traversals during Update/Draw