Support adding and removing workspaces

Frames created via `make-frame' are added to the workspace list;
`delete-frame' removes them from the list.  Floating frames,
non-graphical frames, as well as those associated to different
displays are ignored.

When deleting a workspace, care is taken to reparent that all X clients
another workspace.

	* exwm-workspace.el (exwm-workspace--add-frame-as-workspace)
	(exwm-workspace--remove-frame-as-workspace): New functions that
	intercept created and deleted frames and configure them as EXWM
	workspaces.
	(exwm-workspace--update-ewmh-props): New function to update
	desktop-related EWMH properties after workspace changes.
	(exwm-workspace--init): Use
	`exwm-workspace--add-frame-as-workspace' to create the initial
	workspaces.

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