Mocap 1.4-alpha-7

[1.4-alpha-6 -> 1.4-alpha-7]
-Added player chat messages recording and associated with it settings: "chat_recording" (false by default) and "chat_playback" (true by default).
-Added "transformations" playback modifier group and moved "offset" and "scale" into it.
-Added "transformations/mirror" playback modifier (thanks to Sky for suggestion).
-Added "transformations/rotation" playback modifier.
-Added "entity_filter" playback modifier.
-Added ability to hurt player and other entities in the playback and setting which controls it - "invulnerable_playback" (true by default).
-Added setting "block_allow_scaled" which allows playback of scaled block actions (false by default).
-Added setting "start_instantly" to start recording instantly instead of waiting for movement or second command (false by default) (thanks to Antimality for suggestion).
-Added setting "assign_player_name" to assign recorded player names to a recording (false by default).
-Added setting "show_tips" to enable/disable command tips (true by default).
-Replaced "recordPlayerDeath" setting with "on_death" which defines recording behavior on player death and unlike old setting actually works (end_recording by default).
-Added "instant_save" optional argument to "/mocap recording start" to instantly save recording after stopping (thanks to Antimality for suggestion).
-Added suggestions for "/mocap recording discard/save/list" commands.
-Added different "waiting for action" message specific for recording another player.
-Recording now continues for short period after player death.
-Changed "entities_after_playback" setting type from integer to enum.
-Added error message when saving multiple recordings but there's nothing to save.
-Added mineskin.org URL argument validation.
-Turned playback start "Player not found" and "Player wasn't specified" into failures.
-Merged "Player wasn't specified" message with its tip to fit command block "previous output" box.
-Fixed recording stop/discard commands wrongly suggesting to use stop instead of discard.
-Fixed "record_player_death" setting not working (by removing it) (thanks to damiendier for reporting).
-Fixed recording not stopping when recorded player leaves the server (thanks to damiendier for reporting).
-Fixed some actions being recorded when recording is stopped but not saved (thanks to damiendier for reporting).
-Fixed recording resolver tip saying "to stop" despite being used in commands other than "stop".
-Fixed memory leak caused by advancement listener.