G-API framework

Topics
	G-API Main Classes
	G-API classes for constructed and compiled graphs.
	G-API Data Types
	G-API data objects used to build G-API expressions.
	G-API Standard Backends
	G-API backends available in this OpenCV version.
	G-API Graph Compilation Arguments
	Compilation arguments: data structures controlling the compilation process.
	G-API Serialization functionality
	G-API functions and classes for serialization and deserialization.

Detailed Description