Merge all SCEE ref quests into one

[FloEdelmann]

Fixes #531. Since #529 has not been released yet, removing it should not be a problem.

For reviewing, it makes sense to go through each commit one-by-one, since diffs are displayed for renamed files then.

[Helium314]

Thanks, I think this is fine.
I didn't test, but I assume the filter works correctly? Asking because I'm not sure about evaluation of "a or b and c or d and e" style without parentheses.

@qugebert are you ok with this modification / removal of the guidepost ref quest?

[FloEdelmann]

I assume the filter works correctly?

Yes, I tested it.

I'm not sure about evaluation of "a or b and c or d and e" style without parentheses

and takes precedence over or, so this is correct. This is also how other quests do it:

SCEE/app/src/main/java/de/westnordost/streetcomplete/quests/existence/CheckExistence.kt

Lines 42 to 43 in 9522acc

	or amenity = grit_bin and seasonal = no
	or amenity = vending_machine and vending ~ parking_tickets|public_transport_tickets

... and Tobias prefers this style, as less parentheses is less visual clutter to parse mentally.

[qugebert]

@qugebert are you ok with this modification / removal of the guidepost ref quest?

Yes