Better more accurate immediate mode drawing support for MOAIAnimCurve

[patrickmeehan]

As a user I want better more accurate immediate mode drawing support for MOAIAnimCurve so I will better be able to visually troubleshoot animation errors.

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The current method samples the curve along n steps. Would like an improved method that draws each span individually so every keyframe will be correctly represented. Would also be nice to add an option to draw divots for the keyframes.

Not a huge priority as MOAIAnimCurve is not intended to be a first class drawing object. Just would be useful for troubleshooting motions - make sure our drawing is accurate.