Better stats package.
Correct card back as card-sample in list of games.
Big keyword update.
General cleaning up of style.

Moving "~ to CARDNAME" into auto replace file.
Automatic symbolization of new official affiliations in new styles.
Typeline symbols and watermarks for new official affiliations.
Now showing statistics for frame type. (seems useful)
In Alter and Oversize styles, calling background image more directly instead of having every frame choice point to it.
Ditching an unused card-sample.jpg from oversize style.

* card::contains uses case insensitive find
* Added card::contains_words for quick search, which searches for each word separately

 * invert
 * flip_horizontal
 * flip_vertical
 * rotate

init sockets in main function, otherwise the installer window doesn't work if updates were not checked first

saturate: fix possible division by 0
SaturateImage: fix: had two 'image' members, one inherited, one nullptr, which caused a crash

In particular: in "<tag><tag></tag>x</tag>" the x is now in_tag.
This fixes the rest of #20.

Also added is_in_tag function that returns a bool instead of the tag position.

This way we don't rely on rethrowing exceptions. This method has proven to work well in other projects.

fixed nullptr exception when opening a stylesheet without a game twice, the solution is to re-load when loading/validating fails the first time

Fix #25: Program throws exception when clicking on the 'stylesheet' list if there are no stylesheets.

Fixes #33