Caput with callback

[AlexanderWells-diamond]

Add blocking to the processing of on_update/on_update_name callbacks, to allow caput to correctly wait for processing to complete before returning.

Documented the new blocking flag on OUT record creation, and the SetBlocking function. I didn't document the CothreadDispatcher, as there's no reason for any users to explicitly create it themselves. Let me know if I should document it, or perhaps change its name to indicate its internal-only.

Tests written:

• Various tests that the record-level and global blocking flag are correctly passed to the ProcessDeviceSupportOut class
• A blocking record will correctly process blocking caput requests from both a single thread multiple times and from multiple threads simultaneously.

[codecov[bot]]

Codecov Report

Merging #98 (877a89c) into master (06d6b96) will increase coverage by 0.08%. The diff coverage is 91.89%.

@@            Coverage Diff             @@
##           master      #98      +/-   ##
==========================================
+ Coverage   87.63%   87.72%   +0.08%     
==========================================
  Files          13       14       +1     
  Lines         930      961      +31     
==========================================
+ Hits          815      843      +28     
- Misses        115      118       +3     

Impacted Files	Coverage Δ
softioc/pythonSoftIoc.py	90.00% <ø> (ø)
softioc/cothread_dispatcher.py	80.00% <80.00%> (ø)
softioc/device.py	98.40% <93.75%> (-0.33%)	:arrow_down:
softioc/asyncio_dispatcher.py	93.33% <100.00%> (+0.47%)	:arrow_up:
softioc/builder.py	97.41% <100.00%> (+0.01%)	:arrow_up:
softioc/imports.py	100.00% <100.00%> (ø)
softioc/softioc.py	77.57% <100.00%> (ø)

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[github-actions[bot]]

Unit Test Results

     15 files  ±  0       15 suites  ±0   21m 39s :stopwatch: + 1m 29s    230 tests +  5     224 :heavy_check_mark: +  5      6 :zzz: ±0  0 :x: ±0  3 450 runs  +75  3 010 :heavy_check_mark: +70  440 :zzz: +5  0 :x: ±0 

Results for commit 877a89c1. ± Comparison against base commit 06d6b96d.

:recycle: This comment has been updated with latest results.