Added functionality to always show proxy
Merge remote-tracking branch 'upstream/master'
Added option for always showing proxy

Added Option in Options Menu for always showing proxy when zooming.  Off
/ Always Show Proxy / Show Proxy when holding CTRL.

Added menu option F12 in deck builder to toggle between the two.
Removed unncessary method

IsProxy() is already in Card class
Merge pull request #1028 from saturnattack/master

Options for Showing Proxy when Original Image is available, issue 787