Parkour-SNAPSHOT.591

Updated placeholder descriptions

Parkour-SNAPSHOT.589

Added "%parkour_course_displayname_(course)%" placeholder

Parkour-SNAPSHOT.587: #276 - Update docs to separate essential information

Tidy up placeholders

Parkour-SNAPSHOT.585: Added Course display names (with new placeholder)

Added "OnJoin.BroadcastLevel" to config
Added "JoinCourse" Sounds
Renamed "ResetTimeWithNoCheckpoint" to "ResetProgressWithNoCheckpoint" as all session details are reset now
Made ParkourMessages more consistent
Changed AutoStart reactivation to reset session rather than restart course
Fixed config after fresh install
Tidy up documentation pages

Parkour-SNAPSHOT.583: Added "/pa placeholder (placeholder)" to quickly test placeholder int…

…egration and expected output.

Parkour-SNAPSHOT.581: Docs improvements

Started on Placeholder docs
Fix for Unbreakable flag on 1.8 servers

Parkour-SNAPSHOT.579

Added new 'PlayerParkourRankEvent' event

Parkour-SNAPSHOT.577: Merge pull request #277 from steve4744/master

check if message is empty in TranslationUtils#sendMessage

Parkour-SNAPSHOT.574

Fix `PlayerParkourLevelEvent` not being fired

Parkour-SNAPSHOT.572

Docs improvements