Fixed #557

Limit pixmap cache size to 2047MB; fix #555

also, fix any invalid values loaded from config

Updated chat setting tab

+ Renamed "Messages" to "Chat Settings"
+ Moved the chat mentions to this tab
+ Added boarder round macro settings

Added title for sound settings

Added Korean flag and newly added strings' translations

Realigned Icons

Chat highlighting when username is mentioned

Added translation of some new strings and svg file of South Korean flag.

Flag of South Korea is from
http://commons.wikimedia.org/wiki/File:Flag_of_South_Korea.svg

Clear chat

Users can now clear the chat in the main lobby. This removes unwanted
text and clears up memory when the client has been open a long time.

When being mentioned in a post with '@username' you will now see the entry highlighted. This
helps to see when someone is talking to you. It work across the main
chat, in game and in private chat.

Added account age to user info window

+ Moved Icons to the top. You can now see all options.
+ All SVGs now have a background (GO! was missing one).
+ All SVGs now have the same background (General had one of its own)

+ Added the ability to see the account age of registered users. Changes
are both in server and client. The server will now send back the
registration date along with the user data. The client will then use
this to calculate the account age and display it in the user details
window.

Message log

Resize player names in playerlistwidget properly.

Pixmap memory, 2nd attempt

Conflicts:
	cockatrice/src/dlg_settings.cpp
	cockatrice/src/dlg_settings.h

Reset Always reveal top card when starting a new game.

Apply filters at start

Added timestamps to in game chat

+ added time stamps to the in game chat

Fixed a non-standard word in Korean Translation

Fixed a non-standard word (손패) into the word that is used in official
translation (손)

Remove some duplicated code.