| update: libraries update.
Merge branch 'master' of https://github.com/RecklessGame/RecklessRally

# By Zhu Delun
# Via Zhu Delun
* 'master' of https://github.com/RecklessGame/RecklessRally:
  | UPDATE: solid color rect update
  | update: display issue
  | update: shader manager update.
  + add: GLShaderManager class added. - update: refactor GLPrimitiveRenderer class.
  | update: OpenGL's texture & color update. WIP
  | update: Gwen library update.
  | update: refactor the OpenGL renderer.
  | update:
  | update: deal with the texture loading progress.
  | update: libraries update.