In this PR I replacing the old AndEngine module which was based on OpenGL ES 1.0 branch to the OpenGL ES 2.0 implementation of the same engine.
There's some modifications that were re-applied to the engine as well recovery of removed features.

Benefits of the upgrade:

• Shader-based effects, closes Slider gradient integration. #330
• Sligth improvement of performance in some modern devices. OpenGL ES 2.0 has an improved graphics pipeline and a better memory management when it comes to buffering.
• Modern and chances to upgrade to OpenGL ES 3.0 in the future (I don't think it would be necessary).

The PR is currently on WIP, I'm working on port things to it. Consider this as a second attempt as the original upgrade was intended and tested with the old rimu! code base which had positive results.

Some notes about modifications made in the module besides the upgrade:

• All changes to the touch input handler made in Improve input responsiveness by optimizing operations done in update thread. #303 PR were re-applied.

UPDATED 21/3
Things pending to be fixed in order to set this PR as ready:

• Sliders body quad overlapping wedges are visible in sliders with complex paths.
• Storyboard is partially broken.
• Particles doesn't show with certain blending functions, this includes Kiai particles in MainScene and CursorTrail particles.
  Fixed with f8aeca5
• Some score text sprites have wrong sizes between textures
  Fixed with 3ce12d7
• When focusing the game from being in background sliders and video stops working, this may be due to the custom shaders those elements use.
  Fixed with 62e4f30
• Support blending in the new particles system.
  Fixed with 1eb4d63
• Slider body rendering is completly removed due to uncompatibility, we should consider introduce newer slider rendering.
  Fixed starting from cb177b8
• Sometimes (happens weirdly) the VBO for texts produces an IOOBE, this require further investigation because it can be an engine bug.
  Fixed with 1918204
• Sometimes approach circles appears with full opacity by small time before the circle shows.
  Fixed with 7effdd9 (needs further testing).
• Classic spinner doesn't clip the metre sprite properly.
  Fixed with 28bf98e
• Blinking loading icon at game start.
  Fixed with 93dca14
• Video is not working.
  Fixed with ee9a6a8

For reviewers:

• Commit 2e10760 corresponds to the module change and re-addition of some missing features from the old module. No relevant changes were made here and of course, the project is not compilable here.
• Commits 3e0f9e9 to f0ebbe5 corresponds to some additional changes and recovery of missing features.
• Commit eeb901f and newer corresponds to actual game changes adopting the new engine module, most of them are just imports refactors. At this point the project is now compilable and playable.