Revert "sfx: Use constructor feature for SfxGlobalEvents_Impl."

This reverts commit 9b73d3a4cd9c1aea29b51b1b23d0a44c34f2f8a2
because it breaks unit tests.

Conflicts:
	sfx2/source/appl/appuno.cxx

Change-Id: I7b2d2dc6ff8ade2c8dd29602827313c7bb01f97d