Crash Fix: Removed mod notification code that causes crashes

Corrected mod_name column syntax in warnings table

It was missing a comma at the end of the line.

Updated cockatrice_warnings table to use id column as primary key

Revert "Reimplemented PictureLoader as a singleton"

Reimplemented PictureLoader as a singleton

Added logs tab to allow moderators the ability to review log history

Added official warning messages moderators can use to inform users

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

Fix crash on loading invalid cards.xml

Restore shortcuts

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

Removed unused sound names

Fix #1542

This should fix #1542 (please test)

Minors Fixes for #1527

Changed problematic shortcuts

Moderator ban notifications + Server PM functionality

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

readme / added license badge + link

This closes #1517

remove debug code; fix #1520

shortcut text adjustments

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

fixes #1520

Added chat history to a room that is displayed on join