Reduce the binary size of glbinding libraries

[scheibel]

Approaches:

• Use shorter class names and namespace names and add typedefs (using C++11 using) to restore the established interfaces. Examples
  • Binding -> B
  • glbinding -> glb
  • Function -> F
• Remove extensive use of inline (seems most promising but may impede performance)
• Fine-grained selection of public API (don't export protected and private members), including a completely separation of public and internal interfaces

[scheibel]

Related to #313.