Created class structure to cache and render text with hardware acceleration.
- moved AxisAlignedBoundingBox.as to math package
- added text package and containing classes.
- HardwareGlyph.as does not save the vertex and index buffers anymore. Instead, HardwareCharacterCache.as features global buffers for both
- HardwareGlyph.as does not save the position of a glyph anymore. Instead, HardwareGlyphInstance.as does this.
- HardwareGlyph.as does not render the glyph geometry anymore. HardwareCharacterCache.as renders all glyphs depending on the vertex buffer and index buffer offsets saved in HardwareGlyph.as.