A fairly pure re-factor, although adding disposed window
checking to a number of sites with a warning.

Moves the event emission helpers from VCL into SfxLokHelper: we're
going to need more view / integration here next anyway.

Removes lots of copy/paste horror.

Change-Id: I279c11a1d8093b4feeeb6b7850f500806fff80dd
Reviewed-on: https://gerrit.libreoffice.org/69218
Tested-by: Jenkins
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>