Revert "Fix up the dock pad handling."

This reverts commit 69de03caf2b6f592413ea20a0c7eb412dc962cad.
Revert "Move the rest of the dock panels to the command map."

This reverts commit 07fc6069b1262a14ec983a70bb8b3648e03a86df.

Conflicts:
	Pinta/CommandMapWindow.cs