[#157] bytestrings used consistently, plus docs and tests

[susanw1]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 68.77470% with 79 lines in your changes missing coverage. Please review.

Project coverage is 49.43%. Comparing base (8b6eca6) to head (6ea6a96).

Files	Patch %	Lines
...net/zscript/javaclient/nodes/ZscriptBasicNode.java	0.00%	12 Missing ⚠️
...javaclient/commandPaths/ResponseExecutionPath.java	0.00%	10 Missing ⚠️
...client/commandPrinting/StandardCommandGrapher.java	9.09%	10 Missing ⚠️
...cript/javaclient/commandPaths/ZscriptFieldSet.java	46.66%	8 Missing ⚠️
.../net/zscript/javaclient/commandPaths/BigField.java	70.83%	7 Missing ⚠️
.../net/zscript/javaclient/commandPaths/Response.java	0.00%	7 Missing ⚠️
.../zscript/javaclient/sequence/ResponseSequence.java	0.00%	7 Missing ⚠️
...script/javaclient/addressing/AddressedCommand.java	0.00%	3 Missing ⚠️
...t/zscript/javaclient/sequence/CommandSequence.java	0.00%	3 Missing ⚠️
...et/zscript/javaclient/sequence/ZscriptLockSet.java	0.00%	3 Missing ⚠️
... and 7 more

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #158      +/-   ##
============================================
+ Coverage     46.97%   49.43%   +2.46%     
- Complexity      711      788      +77     
============================================
  Files           130      131       +1     
  Lines          5001     4978      -23     
  Branches        825      820       -5     
============================================
+ Hits           2349     2461     +112     
+ Misses         2444     2311     -133     
+ Partials        208      206       -2     

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