Adds global variables, json parsing, and puts down some ground-work for the character builder/loader
Merge pull request #22 from sarvsav/develop

Added entity class and its features
Fixed some naming conventions for previous commit. Also added defined some error codes and added file-exist checking for character data.
Merge pull request #23 from Izodn/develop

Global variables, JSON parsing, and ground-work for character builder/loader (improved)
Fixed bugs created during Json
Introduced music class and it's constructor
Added play music
Cleaned up music object
Merge branch 'adding-music-feature' into develop