Polygon style render about 13 HOT 1 CLOSED

Approach successfully proven that old Galaxy A7 device FPS grows from 27 to 60.

Polygon-styled emoji looks bad on that low-res, so I decide to mirror current style with hard-edge marching. In addition we need to round resulted positions on hard-edge triangulation.

Flood-fill is applied to remove black thread artefacts on mesh edges for low-res / MSAA modes.

Next steps

• Game loading progress bar would be nice. Now we download images and mesh data from files.
• Clear quad now fills all screen with depth-test, we could split that to rects which are not overlapped by land and reduce clear pass in general.
• Fog render fills the whole screen, we could set 2nd texture as lighting and render land and game objects using fragment shader with lighting enabled
• Remove Virtual joysticks from atlas. That now could be drawn with mesh-primitives + dynamic text

from 13.