Some more Legacy Computing Symbols (pt 3)

[Logo121]

Part of #2189.

Including ranges:

• U+1FBD8 - U+1FBDB (Diagonal box drawings)
  • done by clipping the existing diagonal glyphs.
  • The rest have the "mask or no mask" inconsistency between diagonals that end on edge or corner (as mentioned in Issue with diagonal box-drawing characters #2197, i don't think that's resolved yet), so i'm skipping them for now.
• U+1F5C0 (Folder (U+1F5C0). #2181)
  • Basically using the same process as the pointing finger glyphs. Might look a bit too wide tho.
• U+1CC21 - U+1CC2F, U+1CE51 - U+1CE5F (gapped mosaic)
  • These are encoded regularly (by bit) as there are no duplicates with existing characters (except the empty one).
  • The gap currently depends on the character height (1/10 of height). Not sure if they need to be scaled with weight or something else.

Comparison with FairfaxHD (above):