ThreadUtil: fix comment for interruptAndJoinThreads
ArrayUtil: add a toArray utility method for collections
ThreadUtil: add interruptAndJoinThreads for collections of threads
ThreadUtil: add unit test for sleepUntilMs
ThreadUtil: add unit test for sleepUntilMs
ThreadUtil: add createThreads(Collection<Thread>) and unit tests for interruptAndJoinThreads
all: update changelog and next release version number