Performance fixes

[pieterbos]

It's hard to write good code if this thing keeps returning the same object and that object is immutable. Just return more objects.

Will make parsing slightly more expensive, but shouldn't be a problem - this was mainly done before the ModelInfoLookup classes were written, which means it's performant as is.

Also other performance fixes.

[codecov-io]

Codecov Report

Merging #31 into master will decrease coverage by 0.02%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #31      +/-   ##
============================================
- Coverage     65.97%   65.94%   -0.03%     
+ Complexity     1893     1892       -1     
============================================
  Files           311      311              
  Lines          6686     6681       -5     
  Branches        817      814       -3     
============================================
- Hits           4411     4406       -5     
- Misses         1891     1892       +1     
+ Partials        384      383       -1

Impacted Files	Coverage Δ	Complexity Δ
.../com/nedap/archie/query/APathToXPathConverter.java	79.24% <100%> (ø)	16 <1> (+1)	✅
.../main/java/com/nedap/archie/paths/PathSegment.java	93.33% <100%> (+0.47%)	23 <6> (ø)	❌
.../modelconstraints/ReflectionConstraintImposer.java	100% <100%> (+8%)	6 <6> (ø)	❌
...in/java/com/nedap/archie/query/RMQueryContext.java	72.58% <100%> (+0.44%)	11 <0> (ø)	❌
.../main/java/com/nedap/archie/rminfo/RMTypeInfo.java	90.9% <0%> (-9.1%)	5% <0%> (-1%)
.../java/com/nedap/archie/rminfo/ModelInfoLookup.java	77.06% <0%> (-0.92%)	30% <0%> (-1%)

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[jpleppers]

👍