Complete SkylineTool graphics.lisp remaining TODOs

SkylineTool/src/graphics.lisp has TODOs for:
- +apple-hires-palette+ constant (line 52) - references #1243: #1223
- +ted-palette+ constant (line 221) - references #1243: #1224
- Relative positioning capture (line 1654) - references #1226
- Function to generate file contents (line 1664) - references #1243: #1227
- Conditional compilation (line 2191) - references #1243: #1242
- Unimplemented mode error (line 2552)
- Additional TODO (line 2781)
- NTSC color names note (line 3138)

Note: Some of these reference existing issues (#1243, #1226, #1227, #1242, #1241). Review these TODOs and either link to existing issues or complete the work.