Uses the built in cmake -Dtest=ON

It should download googletest on the fly if needed.

Adds a new make target, `make test`

Ref #167

fix #1547

Fixes #1529.

Completely untested, because I don't think this could possibly interfere with anything. It's a straight revert.

fix #1528

 * Removed remaining picture handling from card database and cardinfo
 * removed the “noCard object” hack

Additionally, move the custom database load after the LoadStatus check,
so that they don't bring up the “fix your card database path” settings
dialog

This should fix #1542 (please test)

Ban based notification to other online moderators is the first form implemented by this PR.

This closes #1517

- `|` over `/` to make `P/T` better readable
- Game play --> Gameplay
- Player - Playing Area

fixes #1520

With this update a new chat history definition is added on a per
room bases which allows operators to specify the number of chat
messages to store and present to the user on join.  Please see
the sample ini for room definitions.

Fix #1499, Fix #1493, Fix #1477
Fix typo

plus misc fixes