evas gl rgba visual/rendering fix try ... again

evas gl rgba visual/rendering fix try ... again

so this is a re-try at the evas gl destination alpha fix. this is what
cedric tried, but done RIGHT. it required adding an ecore_x call to
create a window with correct visual/colormap. it requires doing
visuals totally correctly all the way from ecore_evas to the evas
gl_x11 core. nvidia drivers are very picky about visuals. i also had
to vid the egl/gles code too to do the same thing. nvidia gles/egl
drivers are also picky, mesa is not. this all requires a lot of code
changes. it's far from trivial

this isn't backported for a few reasons:

1. verify this fix doesn't break for anyone.

i tested:

nvidia glx + egl/gles
intel glx + egl/gles
radeon glx

it needs wider testing. nouveau, fglrx for starters and maybe
some other gles/egl drivers.

2. have some review time
3. time to settle before blasting to stable branches

@fix