Fix healing issues

Should fix the issues had...
Clean up raid canHeal
Fix typos
Remove unused roster_fast
PE.raid cleanup
PE.raid local functions
PE.raid canHeal check UnitIsConnected
Rebuild RE.raid.build
Update @coreHealing.needsDispelled
PE.raid update UNIT_HEALTH_FREQUENT
PE.raid add maxHealth
Rewrote PE.raid.acquireTank
acquireTank is not used, move into PE.raid.tank
Rewrote PE.raid.lowestHP
PE.raid.tank sanity checks
Fix PE.raid.build, checking too far
Rewrote PE.raid.raidPercent
Rewrote PE.raid.needsHealing
Rewrote Ancient Barrier for Malkorok
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