Adding jsmn to gitignore
Little addition to the build script
Preliminary Actor Info UI element
Simplifying RL_Object structure a bit

Shortening element access with anonymous structs and unions

New `struct RL_ObjRef` which can point to either an object or a location
in space. In this way the ultimate coordinates can be found by following
the chain of objects all the way up to the top RL_ObjRef which must
necessarily be a location.