- New: img(), play image files. Supports most image formats.

- Fixed context menu weirdness. Was using imgui wrong, and it worked too well.

- Couldn't get to A1 from A2 with cursors. Fixed.

- Ctrl-a selected more than the whole spreadsheet. Fixed.

- Warm reset now clears all cell memories instead of clearing the memory of

  the first cell 1000 times.

- Memory requirements likely slightly smaller due to buffers allocated at
  sample rate, instead of maximum sample rate.

- Maximum samplerate no longer exists. Be reasonable.

- New: rem("this text will be ignored")

- New: nop(). And nop(1). And nop(1,2). And nop(1,2,3). And nop(1,2,3,4). And..

- Some capture device tweaks and bug fixes (related to in())

- Added audio driver selection

- Updated to SDL 2.0.14

- New: catmullrom() spline function