[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()`

So if this was working before because these were already initialized... aren't they being overridden now for the case that used to work before?