Update dashboard buttons.

Specifically, changed Blackboard icon to a more generic Courses icon in
preparation for Canvas support.
Fix crash when map thinks it's loading >1 buildings but it actually isn't.

Crash would occur at line 177 when llbuilder was empty due to a
buildingIdList full of invalid ID's. Set mSetCameraToBounds based on
actual number of found buildings to fix.
Bump version and update changelogs for 1.99.7 release