Use spice instead of rdp for better mouse control

[KP2048]

Discussed in #132

^{Originally posted by Witherking25 September 30, 2023}
When using MS Excel using cassowary, it is a chore to drag and resize charts because when i click to drag, it deselects almost immediately. I have to repeatedly click, drag a little bit, and click again to move/resize. as far as I know, this is an issue with most remote access software. if you could retrofit this to use the spice display stuff, this issue would go away, and it would even make playing games with this viable.

[AkechiShiro]

What is the work necessary to fix this issue @casualsnek any estimate ? How hard is it for a newcomer to the actual codebase of cassowary?