-rename BuildingOverlay -> ExtrusionOverlay,
 even if there is probably nothing else to extrude
- started to draw extrusion layer for proxy tiles
- fixed depth offsetting..
printf--
refactor: move rendering of base layers to separate class
- keep track of GL state in GLState
use GLState for depth and stencil test
start actual BuildingOverlay
cleanup, less bright buildings
fix clipping when drawing proxies
cleanups
improve finding point inside holes
allocate larger buffers for triangulation...
started paged-fling mode, not enabled yet
buildings: decrease contrast with z-distance
theme tweaks
refactor: use getColor()
cleanups
ignore polygons that require additional nodes in trigulation
TileManager, JobQueue: use MapTile[] instead of list
- LineClipper added start(x0,y0), clipNext(x1,y1) 'state' clipping mode
- use vec4 array for extrusion colors -> set color only once for all tiles
- use full range for direction vector in extrusion vertex