Make the colors of the dots in micromapping mode linked to the type of object

[call-me-matt]

Love your app!
Wondering if it would be possible to pre-define at least some of the colors in micromapping mode - I just cannot get used to trees being shown in red and lamps in green, it always confuses me.
maybe already done in #451 ?
maybe possible in #119 .

[Zverik]

This is an idea for #119 — but generally colors are random because there are too many types, hundreds. The editor tries to keep colors as stable as possible during the current session though.