Remove joda and switch to use java.time (requires java 8)

[robneild]

No description provided.

[robneild]

Obviously a bit contentious. Also, I'm not 100% sure about some of the time zone stuff. Anyway here is the code if anyone wants it

[codecov-io]

Codecov Report

Merging #620 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #620      +/-   ##
============================================
+ Coverage     10.43%   10.49%   +0.05%     
- Complexity        0      472     +472     
============================================
  Files           550      550              
  Lines         20436    20446      +10     
  Branches       2626     2018     -608     
============================================
+ Hits           2132     2145      +13     
+ Misses        18151    18148       -3     
  Partials        153      153

Impacted Files	Coverage Δ	Complexity Δ
...t/exchange/webservices/data/core/EwsUtilities.java	19.57% <100%> (ø)	33 <0> (+33)	⬆️
.../exchange/webservices/data/util/DateTimeUtils.java	100% <100%> (ø)	13 <0> (+13)	⬆️
...nge/webservices/data/core/EwsX509TrustManager.java	42.1% <0%> (-2.9%)	1% <0%> (+1%)
...rvices/data/core/request/HttpClientWebRequest.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
...ft/exchange/webservices/data/core/PropertySet.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
...core/response/ExecuteDiagnosticMethodResponse.java	0% <0%> (ø)	0% <0%> (ø)	⬇️

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