Moved setting files & Added code for a future portable build

As per @daenyth’s comment:
https://github.com/Cockatrice/Cockatrice/pull/792#issuecomment-76593730

This is the first implementation of a theme manager. It’s a rebased and
revisited version of #792.

After adding a card to the main or side, the search text will become
selected to easily start the next search

fixed welcome msg
added some articles
added database phrase to card updater
cosmetic changes to the description in edit sets

As per @daenyth’s comment:
https://github.com/Cockatrice/Cockatrice/pull/792#issuecomment-76593730

This is the first implementation of a theme manager. It’s a rebased and
revisited version of #792.

Move the “check unknown sets” method inside the cards database, so that
it can be executed when the card database gets reloaded after a card
database update.
Additionally, show the user a welcome message the first time they run a
new cockatrice version, so that they know why they get shown the “edit
sets” window and how to hide/disable sets.

Needs to be tested on mac

Feature is only included in Qt 5.3+

Added version check, to only include the new Searchbar icon for Users
running Qt 5+

Hard coded CSS might have a slight chance of not rendering the same
across all platforms. More research needs to be performed. Until then I
have removed the hard coded search bar customization.

Please note that I don't feel that the search bar needs to be skinned by
users, hence why it is not part of the large css-skinning project. I
also feel that given the PR #416 a new search bar with highlight the new
search functionality.

Updated the look of the search  bar:
+ larger, curved edges
+ changes color when has focus
+ search icon built into search
- removed "Search For" text in lieu of search icon

+ Card searches now do partial string matches, rather than needing to
match the beginning of the string.

Probably settingscache would have been the correct place for the enum,
but keeping it in the same class/file where price sources are defined
sounds cleaner to me