Most of score event manager handling rewritten

Part of #189, #164, #137.
Don't send GPS tracks twice

Only need the version in the results so don't send in tracks as well
Cache validation

Closes #209
Tidy up revised score event handling
Deep linking

Part of #210
Prettify overprint number locations

Closes #211
Version 0.9.7
Merge pull request #212 from Maprunner/dev

Version 0.9.7