Recognise .glsl files as GLSL.
Replace tabs with spaces.

Make formatting consistent.
Don't highlight numbers at the end of identifiers.
Highlight vector swizzles.
Highlight built-in functions.
Add 'display' to syntax matches where appropriate.
Highlight built-in variables.
Highlight built-in constants.
Merge github.com:rkaup/vim-glsl

Conflicts:
	ftdetect/glsl.vim
	syntax/glsl.vim