HearthStats Import among numerous other changes

Completely reworked the background page and moved a lot of the logic
outside the main script.  Added deck uids rather than indexing by name.
 Added a card secrets page in addition to adding support for user
settings.
Updated manifest
Fixed if HearthStats string is blank or null
Clean up and added .pem file

This reverts commit 350a5a18c06ab690c8bc2681374f013c589226f7.

Conflicts:
	key.pem
Merge pull request #4 from trigun0x2/HearthStats-support

White space cleanup
Delete default deck changes

When the default deck is deleted it’ll reset.  Also, when HS import has
completed the default deck will be unselected to prevent showing a
blank deck.
Merge branch 'HearthStats-support'

This reverts commit 350a5a18c06ab690c8bc2681374f013c589226f7.