Changes to sprite animation system

* Changed the names of some of the functions
* Added functions for setting and returning the projection matrix of the active camera
* Added a function for getting the 2D screen coordinates from a 3D vector
* Added documentation for all the new functions

doc/files/getspritetype.txt

@@ -0,0 +1,15 @@
+#title GetSpriteType [RCBasic Doc]
+#header Function GetSpriteType(sprite)
+
+Returns the collison body type of a sprite.
+
+By default, sprites are dynamic when they are created.
+
+Possible types returned
+#list ul
+#li SPRITE_TYPE_STATIC
+#li SPRITE_TYPE_KINEMATIC
+#li SPRITE_TYPE_DYNAMIC
+#/list
+
+#ref SetSpriteType