ENH: Better text SDF calculation
FIX: Fix tests on windows, remove dep for tests
Merge pull request #357 from Eric89GXL/read-png

FIX: Fix tests on windows, remove dep for tests
FIX: Fix examples
Merge pull request #349 from Eric89GXL/fix-exs

FIX: Fix and reorganize examples
Merge pull request #366 from Eric89GXL/better-sdf

ENH: Better text SDF calculation
Modified ModularVisual to check dimension of color, added reactive polygon test and added color to visuals and examples