By default oracle saves cards.xml to the correct path, where cockatrice
will be able to pick it up;
if oracle is not able to determine the path or the user unchecks the
option, oracle will ask for a save path

Merge branch 'mtgjson-importer' of https://github.com/Daenyth/Cockatrice into Daenyth-mtgjson-importer

Add HQ card option

Updated Windows build howto.

Windows MSVC support

This reverts commit 552a8e0c, reversing
changes made to d0f3ae6c.

Conflicts:
	cockatrice/CMakeLists.txt
	oracle/CMakeLists.txt

Added new app icons, SVG icon not replaced however...

Add the ability to friend/ignore an offline user

* add multiverse id to cards.xml
* remove pictures urls from cards.xml
TBD:
* fix/clean oracle’s gui
* add support in cockatrice

Usermanual update

Conflicts:
	common/server_cardzone.cpp

 * Used http://www.woogerworks.com/files/sets.xml as a base
 * update version
 * use mtgjson.com as source
 * adapted some sets name (es: 6E => 6ED)
Caveats:
 * Not all previous sets are present (e.g.: WOTC, WMCQ, WRL); they were
not present in woogerworks’s sets.xml anyway

Problem: Split card are imported as 2 different cards; need to find
some way to join them

Cmake overhaul