Resolve NXCALS-2675 "Sanitize packages"
#Merge request template @acc-logging-team - please have a look for approval.
packages renaming and:
- changes to SimpleKeyValues, GenericKeyValues and AbstractKeyValues classes (highly simplified, as prompted by: https://issues.cern.ch/browse/NXCALS-1576)
- removed class Tuple2<L, R> (very few quite suboptimal usages, IntelliJ recommended to remove all of them)
Closes NXCALS-2675
Edited by Kamil Krzysztof Krynicki