I did some project restructuring, to include:

• Directory structure: moved src/ files to rtl/ and sim/
• Created ntsc_test and restructured mojo_top to reflect it
• Updated comments in several files
• Deleted no-serial branch and replaced with video-only branch

The biggest change is the addition of BMP file output to the following test benches:

• ntsc_test_tb
• rgb_332_palette_tb
• color_bars_tb

Below is what you should see for the ntsc_test_tb output, which matches what you'd see on the television: