fix ofGet/SetBackgroundColor, replaces #1401 #3315
Merged
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ofSetBackgroundColor has never worked properly, this fixes it
ofGetBackground is deprecated for ofGetBackgroundColor
ofBgColor removed completely, this will break old code but was really wrong
ofbBgClear removed for ofGetBackgroundAuto
also renderers now have to implement:
and windows need to call it in display.
windows don't need to set anymore the vieport, clear the bg...
now the renderers do that instead, before the window had to ask
the renderer if it had to clear the background and with which
color which was mixing the responsabilities of both classes and where
that info was stored
i've tested everything except EGL and iOS but the change in the windows is simple so they should work without problem