Update CustomFont to work better in general
drawString now uses y as the baseline
setSize works in relation to current size
drawString uses VBOs!
linear scaling makes downsizing fonts look ok
drawString also enables GL_BLEND now
add mapBuffer utility to RenderUtil for speedier
buffer write maps of orphaned buffers
Signed-off-by: Unknownloner <unknownloner.online@gmail.com>