initial commit:
- .fs files just dont get packaged in APKs so I had to rename that files to .fsc
- as we dont have a VAO with GLES2 we need to set up every VBOs before using them
- create a image loader class and use it, so we just can set up the default image loader in one place and make use of it (java.awt.* is just not available on android)
  - Android default image loader will be committed somewhere else as we want to compile nifty-renderer-jogl2 on non android platforms as well
GLES2 does not accept G_UNSIGNED_INT for index arrays, actually I already see the nifty gui with some smaller issues already