RCT1 scenario select & sequence

Limit travis jobs

Leave all passing jobs commented out for future reference in hopes they
will be tested with large changes or when doing changes to CMakeLists

- load and save highscores to new file format (highscores.dat)
- scan scenarios from RCT2 data and user data
- load highscores from legacy file (scores.dat)
- fix various issues with new scenario select window