ovg_reset clears any transformations
settable matrix mode (fill, stroke, path, img)
paint convenience fns, disable get* for now

vgGetPaint seems to not work in shivavg
add arbitrary matrix operations
organize test file, add test macros, test squares
reenable getting paints, vgGetPaint fixed in fork

fixed in:
https://github.com/pzl/ShivaVG/commit/c3e7849f42afb47a142938b5842f730dfe6d66a8
save paint colors between test cases