Show coordinate on hover

[cmyr]

This is a bit of an experiment in implementing a global setting; it can be turned on and off from the View menu.

[github-actions]

🗜 Bloat check ⚖️

Comparing 07cc53f against 13c9c70

target	old size	new size	difference
target/release/runebender	4.03 MB	4.07 MB	38.66 KB (0.94%)
target/debug/runebender	22.07 MB	22.15 MB	76.95 KB (0.34%)

[github-actions]

🗜 Bloat check ⚖️

Comparing 8ceece0 against 7b366bd

target	old size	new size	difference
target/release/runebender	4.15 MB	4.18 MB	35.22 KB (0.83%)
target/debug/runebender	22.95 MB	23.01 MB	57.51 KB (0.24%)

[davelab6]

@cmyr I think this can be useful, when do you think it can be merged?

[cmyr]

@davelab6 this is pretty stale at this point, but it could be cleaned up. At the time it didn't feel like it had quite enough polish to justify inclusion.