Sort tracks first by locked/unlocked status, then alphabetically.
Added support for special sort names for each track (e.g. 'The Island'
can be sorted as 'Island' etc).
Rewrote insertionSort to only require operator< (no >),
and removed the unnecessary operators.
Merge branch 'master' of github.com:supertuxkart/stk-code
Merge branch 'master' of https://github.com/supertuxkart/stk-code into ScriptEngine
Removing animations now also removes the corresponding PhysicalObject as well. Additionally opened up the PhysicalObject class to allow for the setting of the interaction type with the future goal of exposing it to scripts