This is the first implementation of a theme manager. It’s a rebased and
revisited version of #792.

Reworked deck editor

Remove Autoclear Issue

Permit the use of the same game type in more rooms; Fix #1119

Fix "welcome" popup appearing more than once

Highlight text after adding card

[WIP] In-client Registration support

After adding a card to the main or side, the search text will become
selected to easily start the next search

text works

Load additional xml sets from $userprofile/customsets/

 * Refactored code out of common/ into servatrice/
 * added smtp client library
 * disable registration when connected
 * validate email address
 * send activation token via email

fixed welcome msg
added some articles
added database phrase to card updater
cosmetic changes to the description in edit sets

 * added missing bits of serverside code;
 * added fronted in client;
 * removed demo python scripts;

Fix crash on server shutdown; fix #1105

Fixed replay crash

Game types are only available in online games.
This is the fastest fix.
Replays now work again.

Updated sounds

Increased server shutdown limit