True Sequencer 1.3.11

Fixed

• No more constant LUA errors on newer clients. Recent WoW builds return some unit values (player and target health especially) as "secret" numbers that addon code may not do math on, so the HUD's low-health and execute-window checks threw an error several times a second, making the addon unusable. Those reads are now guarded: on an affected client the low-health flash and the execute highlight simply stay quiet instead of erroring, and everything else works normally.