bugfix: BSOD in #4.

Dependencies

• [2] RMKMPFT5 fix a corner case when selecting text
• [3] CBPV5SSI stop handling nil screen_line_starting_pos everywhere
• [4] MGOQ5XAV start uppercasing globals
• [5] 7IKRRESB longer names for indices in long loops
• [6] BOFNXP5G clicking now moves the cursor even on long, wrapped lines
• [7] DLQMM265 scroll past first page
• [8] 242L3OQX bugfix: ensure Cursor_line is always on a text line
• [9] BULPIBEG beginnings of a module for the text editor
• [10] HYEAFRZ2 split mouse_pressed events between Text and Drawing
• [11] SVJZZDC3 snapshot - no, that's all wrong
• [12] 6E3HVYWF test and App helper for mouse clicks
• [13] ZUOL7X6V move
• [14] 2INHXC3K position cursor by clicking on text
• [15] DHI6IJCN selecting text and deleting selections
• [16] 2ENZW7TV select text using mouse drag
• [17] 5FW7YOFT highlight selection while dragging
• [18] 3OKKTUT4 up and down arrow now moving by screen line where possible
• [19] ZLJGZYQG select text with shift + mouseclick
• [20] QZH3PQFU .
• [21] OGUV4HSA remove some memory leaks from rendered fragments
• [22] PR4KIAZD first stab at equally hacky cursor down support
• [23] 3GFQP6IR stop saving the entire file when modifying drawings
• [24] DXT4QTAH a few more integer coordinates
• [25] HOSPP2AN crisp font rendering
• [*] OTIBCAUJ love2d scaffold

Change contents

• replacement in text.lua at line 669
  [4.936]→[4.6:39](∅→∅),[4.6]→[4.6:39](∅→∅)
  − function Text.in_line(line, x,y)
  [4.936]

  [4.367]
  + function Text.in_line(line_index,line, x,y)
• replacement in text.lua at line 673
  [4.252]→[3.169:224](∅→∅)
  − Text.populate_screen_line_starting_pos(Cursor1.line)
  [4.252]

  [4.3806]
  + Text.populate_screen_line_starting_pos(line_index)
• replacement in main.lua at line 280
  [4.208]→[4.454:492](∅→∅)
  − if Text.in_line(line, x,y) then
  [4.208]

  [2.1719]
  + if Text.in_line(line_index,line, x,y) then
• replacement in main.lua at line 318
  [4.450]→[4.450:490](∅→∅)
  − if Text.in_line(line, x,y) then
  [4.450]

  [4.82]
  + if Text.in_line(line_index,line, x,y) then