Sectors visualization

[nazar-pc]

A few things here:

• Subspace and relm4 updates
• farm summary state (plotting/replotting/farming) is removed as redundant, the same information is now displayed on per-farm level
• Sectors visualization

Sectors visualization is rendering of a grid of squares, one per each sector on per-farm basis. Color and blinking of the farm corresponds to what happens to the sector:

• gray color for sectors that are not plotted yet
• light blue for sectors that are plotted and up to date
• yellow for sectors that are about to expire and are going to be replotted soon
• pink for expired sectors
• slowly blinking sector is being downloaded
• fast blinking red is being encoded
• slowly blinking light blue is being written to disk

Colors are selected to be a intuitive and to work with both light and dark theme reasonably well.

Resolves #87

[alexhml]

waiting for the windows version