initialize screen width to something reasonable

Dependencies

• [2] G3VLJLDH use the background color
• [3] HFI2YR2C rip out geometry commandline arg
• [4] IZZVOCLB confirm that we have access to all of the love API
• [5] M6JI7UJ7 obsolete comment
• [6] YKRF5V3Z starting to load/save
• [7] AVTNUQYR basic test-enabled framework
• [8] W4UVZETR 2 regressions:
• [9] AD34IX2Z couple more tests
• [10] PESSMQBJ no, make sure to compute line width after screen dimensions
• [11] XSLCFVFH .
• [12] YTSPVDZH first successful pagedown test, first bug found by test
• [13] 73OCE2MC after much struggle, a brute-force undo
• [14] R6GUSTBY default font size and line-height
• [15] AJB4LFRB try to maintain a reasonable line width
• [16] RF5ALVNY allow the window to be resized
• [17] 4VKEE43Z bugfix
• [18] NEXUNNCF extract a function
• [19] QCQHLMST always have a filename
• [20] ESETRNLB bugfix: printing the first part of a line at the bottom made it seem non-wrapping
• [21] 46ASCE5K first commandline arg: window dimensions
• [22] OTIBCAUJ love2d scaffold
• [23] M6TH7VSZ rip out notion of Line_width
• [24] PGZJ6NAT ensure Filename is writable when opened outside a terminal
• [25] AVQ5MC5D finish uppercasing all globals

Change contents

• replacement in main.lua at line 105
  [4.1738]→[3.8:39](∅→∅)
  − initialize_window_geometry()
  [4.1738]

  [4.47]
  + initialize_font_settings(20)
• replacement in main.lua at line 107
  [4.48]→[4.8:39](∅→∅)
  − initialize_font_settings(20)
  [4.48]

  [2.8]
  + initialize_window_geometry()
• replacement in main.lua at line 138
  [3.274]→[3.274:316](∅→∅)
  − App.screen.width = App.screen.width-100
  [3.274]

  [3.316]
  + App.screen.width = 40*App.width(Em)