iTargetingFrames

Ironi:
    - improve binding options (some foolproofing)
show raid target icons instead of macro text in bindings
fix macro text add some error messages
    - change default Losing aggro and Gaining aggro colors
fix Gaining aggro color option
    - aura frames: replace cooldown frame with own duration text
add stack text
add flash for low durations

    fix memory leaking