This adds a unit test to see if the combination of invalidateBlock and
reconsiderBlock do what we expect to do.
The main issue was that we store an invalidated block in the UTXO and we
forgot to re-validate that on reconsider.
Additionally I avoid writing a lot of unchanged data to the block-index.
Move some globals and all stuff pulling in crypto to the
server/serverutil.cpp file
Remove dead code.
Move several items that were used in only one place to the respective
files using them.
Move the class WaitUntilFinishedHelper into its own file.
Made sure no header includes utils.h
remove a handfull of files including utils.h for nothing.
The test assumed at least 2 cores, if you go below that (as the CI
dockers did) then we need to be aware of race-conditions when checking
on the status of the validation.
tomFlowee
TomZ