core Library Integration

Integrating my core library code into the project.

Added four main types:

 - string_t - Dynamic string with full API
 - vector_t - Generic dynamic vector with full API, and deep-copy and destroy optional function callbacks
 - map_t - key,value generic dynamic map with full API, also allows for deep-copy and destroy function callbacks
 - file_t - Dynamic file reader/writer built on string_t and vector_t

These data-structures and data-types are going to be the base of the entire engine.