Small Refactoring

[fampion]

Hi, I used InteliJDeodorant to identify Code Smells and I refactored some of them. Mostly made some complex methods simpler by creating getters.

[codecov]

Codecov Report

Patch coverage: 86.44% and project coverage change: +0.38 🎉

Comparison is base (acf2840) 79.39% compared to head (0399107) 79.77%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #194      +/-   ##
============================================
+ Coverage     79.39%   79.77%   +0.38%     
- Complexity      817      826       +9     
============================================
  Files            71       71              
  Lines          2140     2151      +11     
  Branches        268      261       -7     
============================================
+ Hits           1699     1716      +17     
+ Misses          356      351       -5     
+ Partials         85       84       -1     

Impacted Files	Coverage Δ
.../java/com/github/davidmoten/rtree/Serializers.java	58.20% <50.00%> (+1.45%)	⬆️
...ithub/davidmoten/rtree/fbs/NonLeafFlatBuffers.java	81.35% <50.00%> (+0.65%)	⬆️
...ithub/davidmoten/rtree/internal/RectangleUtil.java	62.00% <50.00%> (+4.00%)	⬆️
...java/com/github/davidmoten/rtree/Backpressure.java	100.00% <100.00%> (ø)
...c/main/java/com/github/davidmoten/rtree/RTree.java	97.93% <100.00%> (+0.04%)	⬆️
...ava/com/github/davidmoten/rtree/SplitterRStar.java	96.29% <100.00%> (+0.29%)	⬆️
...ub/davidmoten/rtree/fbs/SerializerFlatBuffers.java	100.00% <100.00%> (ø)
...ithub/davidmoten/rtree/internal/NonLeafHelper.java	100.00% <100.00%> (ø)

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