Rework the handling of default values for in and out records

[Araneidae]

This commit addresses both github issues #81 and #67.

The arguments to the a and long record builder functions (aIn, aOut, longIn, longOut) are brought more into line with the arguments as used in the epics_device module. This means that extra unnamed arguments can be used to specify EGU and PREC (where appropriate), and for out records the DRV limits take precedence.

As a side effect, the implementation of this is made closer to that in https://github.com/dls-controls/epics_device/

[codecov[bot]]

Codecov Report

Merging #82 (3a5586e) into master (0ace830) will increase coverage by 0.23%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #82      +/-   ##
==========================================
+ Coverage   87.36%   87.59%   +0.23%     
==========================================
  Files          13       13              
  Lines         910      927      +17     
==========================================
+ Hits          795      812      +17     
  Misses        115      115              

Impacted Files	Coverage Δ
softioc/builder.py	97.40% <100.00%> (+0.32%)	:arrow_up:

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[github-actions[bot]]

Unit Test Results

     12 files  ±  0       12 suites  ±0   15m 24s :stopwatch: +27s    224 tests +  4     218 :heavy_check_mark: +  4      6 :zzz: ±0  0 :x: ±0  2 688 runs  +48  2 340 :heavy_check_mark: +48  348 :zzz: ±0  0 :x: ±0 

Results for commit 3a5586eb. ± Comparison against base commit 0ace8305.

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

[Araneidae]

Regarding the lack of tests, I agree that it would be good to add some more tests.