Updates to library for OH 4

[rkoshak]

Cleaning up the code to use OH 4 features, warn about deprecated stuff in logs, and remove unneeded stuff.

timeUtils:

• added deprecation log warnings to deprecated functions
• updated test to remove tests for deprecated functions.

timerMgr:

• made noop private by changing the name from _noop to #noop
• created a getTimerMgr function and export that as a factory. Use var tm = TimerMgr() instead of var tm = new timerMgr.TimerMgr() to instantiate a timer manager
• added getTimerMgr to index.js as an export to TimerMgr and added a warning log when one requires timerMgr.
• updated deferred.js to use the new factory function
• updated test

testUtils:

• added comments
• reimplemented sleep to use java.lang.Thread instead of a busy wait loop

rulesUtils:

• added warning log statements for deprecated functions.

rateLimit:

• added a getRateLimit function to export . Use var rl = RateLimit() instead of var rl = new rateLimit.RateLimit() to instantiate

loopingTimer:

• added a getLoopingTimer function to export. Use var lt = LoopingTimer() instead of var lt = new loopingTimer.LoopingTimer() to instantiate.

helpers:

• use const for constants instead of let

gatekeeper:

• made procCommandGenerator private by changing the _ to the #
• added getGatekeeper function to export. Use var gk = Gatekeeper() instead of var gk = new gatekeeper.Gatekeeper() to instantiate.

deferred:

• made timerBodyGenerator private by replacing _ with #
• use time.toZDT() to get now
• added getDeferred function to export. Use var d = Deferred() instead of var d = new deferred.Deferred() to instantiate.

countdownTimer:

• mande updateItem and iterateGenerator private by replacing _ with #
• • added getCountdownTimer function to export. Use var ct = CountdownTimer() instead of var ct = new countdownTimer.CountdownTimer() to instantiate.

I'm going to let these changes sit for a few days in case there is a hidden new bug before merging.