CompactBlockProcessor - address TODOs from code base

[HonzaR]

Is your feature request related to a problem? Please describe.

Filling an additional issue to provide a link to the code base TODO occurrence. This should be ideally split into several more detailed issues once we're on solving it.

TODOs overview:

• updateRanges: rethink this and make it easier to understand what's happening. Can we reduce this so that we only work with actual changing info rather than periodic snapshots? Do we need to calculate these derived values every time?
• we still need a way to identify those transactions that failed to be enhanced
• refreshUtxos: cleanup the way that we prevent this from running excessively. For now, try for about 3 blocks per app launch. If the service fails it is probably disabled on ligthtwalletd, so then stop trying until the next app launch.

[HonzaR]

I am closing this as all these ad hoc issues in the code base have been resolved or moved to a separate issue.