[FINAL] MOAIFreeTypeFont: Fix NumberOfLinesToDisplayText()

`NumberOfLinesToDisplayText()` would always crash if called outside of a render function because `mGlyphArray` and `mAdvanceArray` are explicitly created and cleared by `RenderTexture()`

This PR adds the initialization and teardown to `NumberOfLinesToDisplayText()`

They were being initialized in the render function, not in other entry points.
But I've just realized I've placed the fix at the wrong location. RenderTexture does call NumberOfLinesToDisplayText indirectly.