Very basic drawing board.

## Moving

Arrow keys or hjkl. `i` to enter input mode. Use the enter key to finish a line or rectangle. Escape to cancel line or rectangle in progress.

## Input Commands

- `line/l`: Start line with current point as start. Move and hit enter to determine line endpoint
- `rect/r`: Start rect with current point as a corner. Move and hit enter to determine the opposite corner
- `circle/c`: Start circle with current point as centre. Move and hit enter to determine radius
- `color/co/colour [lowercase 6 char hex string]`: Set current colour
- `linewidth/lw [int]`: Set current line width
- `undo`: Undo last draw
- `clear`: Clear all drawings