Consolidate Default Icon Set: Seti

[alex-courtis]

We currently have a mix of icon sets

      2 fae-
      7 NOGLYPH-
      8 cod-
     13 oct-
     27 custom-
     31 linux-
     32 fa-
     58 md-
     76 dev-
    122 seti-

Seti is the majority and should be used wherever possible.

#192 will ease this change.

[alex-courtis]

There are only 167 seti icons. We could add them all.

: ; cat glyphnames.json | jq -r 'keys[]' | sed -E 's/([^-])-.*/\1/g' | sort | uniq -c
    387 cod
     33 custom
    191 dev
    786 fa
    170 fae
      5 iec
      2 indent
      1 indentation
    115 linux
   6880 md
      1 METADATA
    310 oct
      9 pl
     32 ple
     11 pom
    167 seti
    228 weather