lazyBitmap
Returns, creates and caches a LazyBitmapFont instance from the VectorFont that will generate and cache glyphs as required.
Gets a BitmapFont from the font, that is going to be computed lazily as glyphs are required.
If the font is already a BitmapFont the instance is returned, if a VectorFont is used, it returns a LazyBitmapFont that will compute glyphs as required.