Inspector analytics improvements

[alexander-yakushev]

First part is pretty minor – allow analytics for all maps and for arrays.

The second part is a bit more involved. Sometimes, it is beneficial to display a map as map after you order it somehow – sort by keys or values or anyhow else. However, turning that sorted list of MapEntries back into an array-map just so that inspector or printer displays it properly without messing up the entry order is inefficient. Thus, I've added a meta flag that is interpreted by inspector, printer, and pretty-printer as "show this sequence of mapentries as a map".

This is currently only used for displaying frequencies computed by inspector analytics. We have tests for that functionality, so no new tests are necessary.

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• You've updated the changelog (if adding/changing user-visible functionality)

[alexander-yakushev]

Update: I came up with a much simpler solution for producing maps sorted by values.