initialize to zero
OpenGLES2 shaders to replace fixed pipeline and some basic effects
Updated to freetype 2.5.3
getDimension no longer calculate character height every time anymore. Instead for a certain font of a certain size, the line height (at least the default line height) should be predetermined at the point of initializing/loading stage of the font. Also originally the calculation involved was using ascender info plus the most descended glyph as the total line height, but that value was actually not honored when drawing and outputing the whole text with newlines. It used only ascender data, and of course that will cause clutter at some point.