Release 0.5.19

Update release date

Version bump everything

Update to 0.5.16

Also use that new method to install dependency games.

Typo!!!!!!!!

Update release date and contact email

Try to get the running game object if possible for the context menu

This can mean seeing stale data, but since the running game has the
information about the processes that are running, we need it for 'Stop'
to work properly.

Resolves #4816

Beef up the changelog with more bragging!

Add changelog note for xemu