1.21 Book Revisions

[IridescentVoid]

tentative list of changes to make to the notebook:

• define 'hex'/'evaluatable'
  • standardize terminology use across the book, as many places (such as intro/retro) describe "lists of patterns" which is misleading and possibly confusing
• remove the Influences section, note special behavior of escapes, put null and garbage in 101 or their own entry
• overhaul the A Primer On Vectors section
• reorganize/partial rewrite of metaevals section (split into two)
  • better explanation of jumps/continuations
  • clarify that Charon's Gambit will end an outer execution frame if cast directly as a pattern iota with Hermes' Gambit
  • depends on Add patterns from overevaluate #1107
• reorganize/partial rewrite of escapes section
  • depends on Advanced parenthesis patterns (and they're Actions now) #1103 and Add Contemplation pattern #1102
  • iota escaping description satisfactory for closing Improve documentation of iota embedding #737

consider also addressing #262 with item renames?