Updated grammar

[pieterbos]

Lots of fixes:

• refactored grammar so we can do 'true = false' and it will evaluate to false instead of being a syntax error. This also prepares it for other types like string operations
• The < and <= operator did <= and < respectively
• Added == and != operator precedence to make 1 < 2 = 3 < 5 evaluate to true without parentheses
• Refactored the rules grammar to camelCase instead of snake_case because that's the ANTLR convention and snake_case produces very ugly looking java code.

[codecov-io]

Codecov Report

Merging #27 into master will increase coverage by 0.21%.

@@             Coverage Diff              @@
##             master      #27      +/-   ##
============================================
+ Coverage     65.65%   65.86%   +0.21%     
- Complexity     1857     1882      +25     
============================================
  Files           309      309              
  Lines          6609     6644      +35     
  Branches        793      804      +11     
============================================
+ Hits           4339     4376      +37     
  Misses         1895     1895              
+ Partials        375      373       -2

Impacted Files	Coverage Δ	Complexity Δ
...n/java/com/nedap/archie/json/TimeDeserializer.java	60% <ø> (-40%)	2 <ø> (ø)
...va/com/nedap/archie/json/DateTimeDeserializer.java	60% <ø> (-40%)	2 <ø> (ø)
...n/java/com/nedap/archie/json/DateDeserializer.java	60% <ø> (-40%)	2 <ø> (ø)
...va/com/nedap/archie/json/DurationDeserializer.java	20% <ø> (-13.34%)	1 <ø> (ø)
...main/java/com/nedap/archie/rules/OperatorKind.java	100% <100%> (+14.28%)	6 <ø> (+1)	✅
...a/com/nedap/archie/rules/evaluation/ValueList.java	84.05% <100%> (+4.34%)	29 <4> (+2)	✅
...va/com/nedap/archie/adlparser/ADLParserErrors.java	64.7% <100%> (-1.97%)	10 <1> (-1)
...evaluation/evaluators/BinaryOperatorEvaluator.java	61.01% <61.53%> (+6.73%)	73 <8> (+16)	✅
...edap/archie/adlparser/treewalkers/RulesParser.java	80.13% <78.82%> (-0.67%)	49 <17> (+4)
... and 3 more

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[steijgeler]

Refactor mult_binop to multBinop as well?

[steijgeler]

integerValue

[pieterbos]

this has been defined in another file and cannot be refactored at the moment

[steijgeler]

realValue

[pieterbos]

this has been defined in another file and cannot be refactored at the moment