[Logging] Missed adding PID to one log printf
[Schedule] Fix bug affecting back to back scheduling.

If GetWeeklySecondDifference() was called during the second a
schedule is supposed to start, it would return a difference of
one full week instead of 0 seconds.
[MultiSync] Fix race condition in sync code.
[Developer] Add helper buttons to developer page for debugging.

Buttons include:

- Step - single-step a paused sequence one frame forward
- Step Back - single-step a paused sequence one frame backwards
- Reset Local Changes - performs a "git reset --hard HEAD" to revert
  local changes to the git clone to make it easier for users to
  undo changes made by hand.