Send TRIAL actions from Practice Mode

For testing/debugging purposes, this release uses Practice Mode to send a TRIAL action with mostly hardcoded parameters, so test apps can prepare for the real Trial Mode. The Appendage is hardcoded per app, (see the startPracticeMode() method of MainActivity for more details), the patient id is set to the current patient id, and it's always trial 1 out of 3, difficulty 1. Also fixed the bug where the outdoors and indoors actions were swapped. This is not on master, it is on the trial-test branch, so make sure to switch branches if you download the source. An APK is also included for convenience, but I recommend checking the source out for yourself.