[WIP]Implement GLSL vector selectors.

Generate vector selectors from one T4 template file.  (ex. vec2.st, vec3.xyz, vec4.rgba)
Now, these properties throw NotImplementException just like another ShaderTK code.

Selector informations are based on [GLSL Core Tutorial &#8211; Data Types » Lighthouse3d.com](http://www.lighthouse3d.com/tutorials/glsl-core-tutorial/glsl-core-tutorial-data-types/).

Note:

- indexer is not implemented.
- it generates garbage file too