* ignore .tx folder
 * cmake: when UPDATE_TRANSLATIONS=ON, extract new strings only to the
english translation file.
 * added info in CONTRIBUTING.md
 * updated english translations

Updated logo

Consistency for certain affixes

Added new strings for Cockatrice
New Oracle translation
Cleaned up vanished strings

Translations have been updated.

Imported unzip methods from OSDaB-Zip project;
Adds a soft dependency on zlib to oracle; if lib if not found, oracle
will continue to compile and work but without zip support.

 * Always install “release” plugins
 * install only plugins actually used

ucfirst(setCode): requires oracle re-run
reorder columns
rename the “short name“ column as “set code“
ensure proper casting for releaseDate and sortKey fields (refs 00a5ed0b)

Let oracle add a basic TK set in cards.xml
Unify all the code previously using the string literal “TK”

and save them in cards.xml

Should avoid the problem explained in #414

fixes #411

Fixed a bug that caused Oracle to be stuck in an infinite loop if the default path checkbox was checked but failed to write.

If a path to cards.xml is set, Oracle will update that cards.xml.
If Oracle is run before a path to cards.xml is set, if default is checked, cards.xml will be saved on the AppData path. Furthermore, this path will be set as the cards.xml path for both Oracle and Cockatrice.
If Oracle is run before a path to cards.xml is set, if default is NOT checked, cards.xml will be saved at the selected path and this path will be set as the cards.xml path for both Oracle and Cockatrice.
If a path to cards.xml is set, if default is NOT checked, cards.xml will be saved at the selected path but this path will NOT be set as the cards.xml path for either Oracle or Cockatrice. This allows people who already have a cards.xml (which may be customized), to still obtain clean copies of cards.xml through Oracle without overwriting their own