Remove unused methods from Plane
Eliminate most uses of BitmapScreen
Add Bitmap::MaskedBlit
Remove Bitmap::SetPixel, BitmapUtils::SetPixel
Change font code to use MaskedBlit
Remove Bitmap::GetPixel, BitmapUtils::GetPixel
Remove BitmapUtils::CheckOpacity
Complete elimination of BitmapUtils
Update autoconf build for bitmap_utils removal
Remove (empty) bitmap_utils.cpp/.h
Remove C++11-ism (cbegin/cend)
Simplify font handling
Fix text shadow handling (solid color, not gradient)
Remove code left unused following previous commit
Merge pull request #366 from glynnc/master

Remove unused methods from Plane