GlobalFunctions: Clean up comment sections
GlobalDefinitions: Remote KR_SECONDS and KR_MICROSECONDS constant (unused)

Follows-up 715147c which removed kfTimeSince().
BaseTool: Remove deprecated getScripts and getStyles methods
sample-LocalConfig: Add FileCacheStore
GlobalFunctions: kfApiRequest now returns an object instead of array

Some tools already do this in their own "get API" method because of
performance reasons and ease of use (always passed by reference,
especially with large data sets this can get messy with arrays).

Folding that enhancement back into the main kfApiRequest method
so that we can get rid of the ad-hoc implementations.