* Update supertuxkart.appdata.xml
Update description, using parts from https://supertuxkart.net/Discover
* Update references to tracks to mention better ones
* added widget to track info screen to select between Free-For-All and Three Strikes Battle
* setting AI to zero and setting time target to 2 minutes for testing
* setting also hitcapture limit to prevent immediate race end
* setting m_count_down_reached_zero to false in ffa reset to allow starting a new race after the previous ended through time limit
* integrated necessary adjustments and made possible to set time target
* removed unused spinner variable
* use translations
* centralized is_soccer and show_ffa_spinner variables
* setting target value spinner visible/invisible depending on ffa game type
* using no hittarget and fix for this in free for all mode
* set use_highscores to false for FFA
* disabling AI for FFA
* disable hit limit icon for FFA if no hit limit is set ( = 0 )
* changed icon and name of three strikes battle to only battle in race setup screen
* set AI to Battle AI if mode is FFA
* added config parameters for FFA
* added define which can be used to enable FFA AI
* resolved merge conflict
* moved ffa options higher
* fix for setting ai karts
* improved m_show_ffa_spinner and m_is_soccer
* removed code for disabling widgets for FFA AI
* implemented requested changes
* Update config to use the new online servers. Remove hardcoded certificate as we will use Let's encrypt from now on
* Fix new server SSL curl certificate by shipping CA bundle from https://curl.haxx.se/docs/caextract.html
* Remove debug log for curl host
* Move server config to stk_config.xml and Update news.xml redirects
