Fix of coastlines

Remaining issues (e.g. in tile 5x11@4) are caused by data itself, and
should be corrected in generator. Victor pointed to Douglas-Peucker
algorithm used for simplifying data at generation.
Fix SWIG
coastline_line objects must be drawn irrespectively of debug flags
Normalize coordinates before returning them
Remove obtainTileImmediate and obtainTileDeffered in favor of obtainTile
Fix map tiles foundation and lakes rasterization
Fix stringtable issues
Use less space
Fix eyepiece tool
Remove useless line
stdint.h -> cstdint
Various changes. See detailed message

 - Separate network module
 - Rewritten threading scheme of map renderer
 - Many minor code tweaks
assert.h -> cassert
Update GLES2
Fix uninitialized values
Update giflib from 4.2.1 to 4.2.3
Update zlib from 1.2.7 to 1.2.8
Update libpng from 1.5.13 to 1.6.3
Update jpeg from 8d to 9
Update freetype from 2.4.10 to 2.5.0.1