gpu/dma: Fix DMA2 (VRAM->RAM) reads and implement GPUREAD (VRAM->CPU)

bus/logging: Lower log level of IRQ_CONTROL reads/writes

readme: Make it useful

data: Create data/cdrom

util/log: Increase GTE log level

main: Support one argument with the CD main binary path

gui: Remove hard-coded CD-ROM root path

gui: Add menu item for Timers

gte: Complete command method comments & stub remaining cmds

gui/settings: Full-screen option

gui: Show GP0 cmd count for each frame

renderer/rasterizer: Fix Drawing Offset

cpu/gte: Implement most GTE commands

util/bit_utils: Improve leading_zeroes()

rasterizer: Implement Gouraud shading for textured primitives