Use 32-bit visual for frame containers

* exwm-core.el (exwm--get-visual-depth-colormap): New function.
* exwm-workspace.el (exwm-workspace--add-frame-as-workspace): Use
Emacs' frame's visual, depth and colormap. Reset all attributes
that refer (also by default) to the parent window (the root
window), as it might have a different visual, depth or colormap.

Special-thanks-to: Elijah Malaby <qwe12345678910@gmail.com> for figuring out the
  changes needed to suport 32-bit visuals and proposing the initial
  version of this improvement.

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