Graphics pipeline refactor #461
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Also fixed case issue in trappable commands list
* Move text rendering Lua-side. * Simplified digit font to use 32x8 font bitmap like everything else. * All Canvases are now internally backed by a 32-bit buffer, to simplify rendering. * All custom inverted drawing logic moved from Canvas to CGContext, CGContext.draw() now being given direct access to the Canvas backing buffer to facilitate that. * Direct (non-CoreGraphics) line drawing logic now used for all modes, not just inverted, for consistency (no more hairy lines as a result). Also fixed off-by-two error in that logic when drawing lines with negative x or y direction. * Box drawing also updated to use direct line drawing. * All invert operations now supported on colour drawables as well as greyscale ones. * Invert supported on all gCOPY (and now by extension, text rendering) operations. * Improved performance of text rendering with optimised .copy and .mcopy operations. * Canvas.swift and CGContext.swift no longer rely on anything from UIKit. * More consistent support for gSETPENWIDTH. * Be bug-compatible with allowing negative colour values in gCOLOR.
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