util: add SpatialGrid class
spatial grid: added GridNeighborsAtTopLeft
render: 1st step on the way to support basic shapes
render: extract shape definition to external class
network: fix valgrind warning
render: fix triangle/hexagon drawing
TextRendering: Initialize all variables
Add color paramater
Add lineRectangle method
Added pointLine method
use --jcache option for emscripten (don't recompile if no changes applied)
Added GridSystem
render: fix VBO code path
changed entityName method for release version (should return a string too)
epsilon value is outside of the methods
grid: add GridPos to/from GL position methods
render: flush batch earlier
grid: add test method to browse through all cells
render: experimental dynamic vertices code
Default z-value must be 1 instead of 0 (misconfigured component -> visible)