#1250: JPA/Hibernate Removal + General improvements

[salaboy]

Removing JPA/Hibernate dependencies from the spring boot starters and making general formatting and bool == false (unnecessary bool comparisons) improvements.

[codecov]

Codecov Report

Merging #1253 into master will increase coverage by 0.11%.
The diff coverage is 68.42%.

@@             Coverage Diff              @@
##             master    #1253      +/-   ##
============================================
+ Coverage     56.66%   56.77%   +0.11%     
+ Complexity     9241     9236       -5     
============================================
  Files          1151     1148       -3     
  Lines         40577    40774     +197     
  Branches       5924     5926       +2     
============================================
+ Hits          22991    23150     +159     
- Misses        14858    14899      +41     
+ Partials       2728     2725       -3

Impacted Files	Coverage Δ	Complexity Δ
...g/boot/actuate/endpoint/ProcessEngineEndpoint.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...va/org/activiti/model/converter/TaskConverter.java	80% <ø> (+0.83%)	0 <0> (ø)	⬇️
.../src/main/java/org/activiti/client/model/Task.java	100% <ø> (ø)	0 <0> (ø)	⬇️
...del/resources/assembler/TaskResourceAssembler.java	57.14% <ø> (-12.09%)	0 <0> (ø)
...tor/language/json/converter/BpmnJsonConverter.java	82.02% <ø> (+0.5%)	97 <0> (ø)	⬇️
...ti/spring/boot/ProcessEngineAutoConfiguration.java	0% <ø> (ø)	0 <0> (?)
...language/json/converter/BaseBpmnJsonConverter.java	53.3% <ø> (+0.62%)	60 <0> (ø)	⬇️
...ctiviti/spring/boot/EndpointAutoConfiguration.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...mn/behavior/EventBasedGatewayActivityBehavior.java	100% <ø> (ø)	1 <0> (ø)	⬇️
...java/org/activiti/engine/impl/db/DbSqlSession.java	62.97% <ø> (-0.02%)	148 <0> (ø)
... and 56 more

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[salaboy]

@erdemedeiros @ryandawsonuk feel free to review these changes.. There are a lot of formatting changes so it gets really difficult, but mainly I did the changes regarding boolean comparisons and I've removed the JPA/Hibernate dependency from the starter. If I don't get any review I will just merge this to avoid further conflicts. Both CodeCov and Codacy seems to be happy about the changes :)