adds add_rect_outline(x, y, w, h, thickness, direction, color)

Слиты nikitronn запросил слияние shader_utils_update в master

Created by: zeffii

adds new primitive to shaderlib2d

add_rect_outline(self, x, y, w, h, thickness, direction, color)
f.add_rect_outline(0, 0, 8, 4, 2.0, "both", black)
f.add_rect_outline(10, 0, 8, 4, 1.0, "inside", black)
f.add_rect_outline(22, 0, 8, 4, 2.0, "outside", black)

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