gumball → ifaces Relation

File in libapigumball	Includes file in libapigumballifaces
gumball_ifaces.h	gumball_iresource.h
core / gumball_manager.h	gumball_iresource.h
types / gumball_font.h	gumball_iresource.h
types / gumball_texture.h	gumball_iresource.h