Initial look at reducing size of then stack.

[sagenschneider]

This is done by keeping then function at top, and appending further then
functions to the end. Costs a little more in adding then function, but
should reduce a lot more in execution (and GC)

[codecov]

Codecov Report

Merging #812 (83265ba) into master (10d704e) will decrease coverage by 0.04%.
The diff coverage is 78.52%.

@@             Coverage Diff              @@
##             master     #812      +/-   ##
============================================
- Coverage     81.62%   81.58%   -0.05%     
+ Complexity    12412    12411       -1     
============================================
  Files          1279     1279              
  Lines         55787    55815      +28     
  Branches       7087     7091       +4     
============================================
- Hits          45535    45534       -1     
- Misses         8215     8247      +32     
+ Partials       2037     2034       -3     

Impacted Files	Coverage Δ	Complexity Δ
.../net/officefloor/frame/test/TestManagedObject.java	92.18% <ø> (ø)	11.00 <0.00> (ø)
...et/officefloor/frame/test/OfficeFrameTestCase.java	33.79% <50.00%> (ø)	22.00 <0.00> (ø)
...t/officefloor/frame/test/CompleteFlowCallback.java	75.00% <63.63%> (-12.50%)	6.00 <1.00> (+1.00)	⬇️
...et/officefloor/frame/test/ThreadedTestSupport.java	71.26% <69.23%> (-0.54%)	17.00 <5.00> (+3.00)	⬇️
...oor/frame/impl/execute/thread/ThreadStateImpl.java	80.41% <76.23%> (-3.09%)	61.00 <5.00> (+2.00)	⬇️
...floor/frame/impl/execute/job/FunctionLoopImpl.java	88.29% <88.88%> (+3.81%)	15.00 <1.00> (ø)
...ficefloor/frame/test/OfficeManagerTestSupport.java	90.90% <90.90%> (-2.85%)	7.00 <4.00> (+2.00)	⬇️
...frame/impl/execute/executive/DefaultExecutive.java	86.11% <100.00%> (ø)	13.00 <0.00> (ø)
...xecute/function/AbstractDelegateFunctionState.java	63.63% <100.00%> (-7.80%)	5.00 <3.00> (ø)
...xecute/managedobject/ManagedObjectCleanupImpl.java	93.61% <100.00%> (-1.22%)	4.00 <0.00> (ø)
... and 9 more

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