make a few names consistent with snake_case

Dependencies

• [2] CUFW4EJL reorganize app.lua and its comments
• [3] LNUHQOGH start passing in Editor_state explicitly
• [4] KKMFQDR4 editing source code from within the app
• [5] S2MISTTM add state arg to a few functions
• [6] OI4FPFIN support drawings in the source editor
• [7] Z5HLXU4P add state arg to a few functions
• [8] 7CLGG7J2 test: autosave after any shape
• [9] 7IDHIAYI rename modifier_down to key_down
• [10] ISOFHXB2 App.width can no longer take a Text
• [11] BH7BT36L ctrl+a: select entire buffer
• [12] 2L4DL7PG go through App in a couple more places
• [13] 4KC7I3E2 make colors easier to edit
• [14] LF7BWEG4 group all editor globals
• [15] G54H3YG2 get rid of all bifold text
• [16] H4R5BHVY no more Text allocations
• [17] UHB4GARJ left/right margin -> left/right coordinates
• [18] JFFUF5AL override mouse state lookups in tests
• [19] HKV72RZV bugfix: save modified files in save directory
• [20] IFTYOERM line.y -> line_cache.starty in a few more places
• [21] P7FOVH3D document a couple of miscellaneous helpers
• [22] PX7DDEMO autosave slightly less aggressively
• [23] 2L5MEZV3 experiment: new edit namespace
• [24] R3KXFRZN get rid of to_text
• [25] N2NUGNN4 include a brief reference enabling many useful apps
• [26] AD34IX2Z couple more tests
• [27] ZLJGZYQG select text with shift + mouseclick
• [28] MTJEVRJR add state arg to a few functions
• [29] JF5L2BBS test harness now supports copy/paste
• [30] PTDO2SOT add state arg to schedule_save
• [31] 3QWK3GSA support mouse clicks in file navigator
• [32] AVTNUQYR basic test-enabled framework
• [*] 3QNOKBFM beginnings of a test harness

Change contents

• replacement in source_edit.lua at line 451
  [3.161908]→[3.161908:161938](∅→∅)
  − App.setClipboardText(s)
  [3.161908]

  [3.161938]
  + App.set_clipboard(s)
• replacement in source_edit.lua at line 457
  [3.162161]→[3.162161:162191](∅→∅)
  − App.setClipboardText(s)
  [3.162161]

  [3.162191]
  + App.set_clipboard(s)
• replacement in source_edit.lua at line 466
  [3.162587]→[3.162587:162637](∅→∅)
  − local clipboard_data = App.getClipboardText()
  [3.162587]

  [3.162637]
  + local clipboard_data = App.get_clipboard()
• replacement in reference.md at line 382
  [3.11956]→[3.11956:12026](∅→∅)
  − * `App.getTime()` -- returns the number of seconds elapsed since some
  [3.11956]

  [3.12026]
  + * `App.get_time()` -- returns the number of seconds elapsed since some
• replacement in reference.md at line 386
  [3.12119]→[3.12119:12193](∅→∅)
  − * `App.getClipboardText()` -- returns a string with the current clipboard
  [3.12119]

  [3.12193]
  + * `App.get_clipboard()` -- returns a string with the current clipboard
• replacement in reference.md at line 390
  [3.12282]→[3.12282:12359](∅→∅)
  − * `App.setClipboardText(text)` -- stores the string `text` in the clipboard.
  [3.12282]

  [3.12359]
  + * `App.set_clipboard(text)` -- stores the string `text` in the clipboard.
• replacement in edit.lua at line 462
  [3.13365]→[3.13365:13395](∅→∅)
  − App.setClipboardText(s)
  [3.13365]

  [3.13395]
  + App.set_clipboard(s)
• replacement in edit.lua at line 468
  [3.13602]→[3.13602:13632](∅→∅)
  − App.setClipboardText(s)
  [3.13602]

  [3.13632]
  + App.set_clipboard(s)
• replacement in edit.lua at line 477
  [3.2709]→[3.13982:14032](∅→∅),[3.13982]→[3.13982:14032](∅→∅)
  − local clipboard_data = App.getClipboardText()
  [3.2709]

  [3.14032]
  + local clipboard_data = App.get_clipboard()
• replacement in app.lua at line 172
  [3.387]→[2.2155:2230](∅→∅)
  − -- If you access the time using App.getTime instead of love.timer.getTime,
  [3.387]

  [2.2230]
  + -- If you access the time using App.get_time instead of love.timer.getTime,
• replacement in app.lua at line 177
  [3.1511]→[3.1511:1534](∅→∅)
  − function App.getTime()
  [3.1511]

  [3.1534]
  + function App.get_time()
• replacement in app.lua at line 188
  [3.2820]→[2.2333:2593](∅→∅)
  − -- If you access the clipboard using App.getClipboardText and

  − -- App.setClipboardText instead of love.system.getClipboardText and

  − -- love.system.setClipboardText respectively, tests will be able to manipulate

  − -- the clipboard by reading/writing App.clipboard.
  [3.2820]

  [2.2593]
  + -- If you access the clipboard using App.get_clipboard and App.set_clipboard

  + -- instead of love.system.getClipboardText and love.system.setClipboardText

  + -- respectively, tests will be able to manipulate the clipboard by

  + -- reading/writing App.clipboard.
• replacement in app.lua at line 194
  [3.2839]→[3.2839:2871](∅→∅)
  − function App.getClipboardText()
  [3.2839]

  [3.2871]
  + function App.get_clipboard()
• replacement in app.lua at line 197
  [3.6983]→[3.2895:2928](∅→∅)
  − function App.setClipboardText(s)
  [3.6983]

  [3.2928]
  + function App.set_clipboard(s)
• replacement in app.lua at line 420
  [3.913]→[3.1742:1777](∅→∅),[3.2791]→[3.1742:1777](∅→∅),[3.1777]→[3.2953:3061](∅→∅),[3.2791]→[3.2953:3061](∅→∅)
  − App.getTime = love.timer.getTime

  − App.getClipboardText = love.system.getClipboardText

  − App.setClipboardText = love.system.setClipboardText
  [3.913]

  [3.369]
  + App.get_time = love.timer.getTime

  + App.get_clipboard = love.system.getClipboardText

  + App.set_clipboard = love.system.setClipboardText