More SWIG style declarations so less work for each target language

[域外創音]

Objectives:

• Use %typemap to glue up the return value array pointer with the out argument array length;
• Use %extend to generate constructor functions for common structs, so we can prepare values during struct instance construction call in most script languages, eg. vec = raylib.Vector2(100,100)

[域外創音]

New objective added:

• Use %typemap to alter functions that passes struct values in params: Convert those params to basic type params(int, float, char* etc.) or script type params(luatable etc.) for better exposure to the script language, by avoiding rapid copying from the script owned object structs to the param structs