Rm to markdown serializer

[pieterbos]

Makes a human readable output from RM instances.

Status: first attempt at something. Not done is any kind of way.

Custom serializers. If custom is not found, will fallback to a reflection based mechanism.

[codecov]

Codecov Report

Patch coverage: 66.00% and project coverage change: -0.08% ⚠️

Comparison is base (6fa083d) 71.39% compared to head (157d683) 71.32%.
Report is 38 commits behind head on master.

❗ Current head 157d683 differs from pull request most recent head da408ff. Consider uploading reports for the commit da408ff to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #503      +/-   ##
============================================
- Coverage     71.39%   71.32%   -0.08%     
- Complexity     6870     7000     +130     
============================================
  Files           661      701      +40     
  Lines         22582    23031     +449     
  Branches       3659     3698      +39     
============================================
+ Hits          16123    16426     +303     
- Misses         4714     4832     +118     
- Partials       1745     1773      +28     

Files Changed	Coverage Δ
.../serializers/datatypes/DvProportionSerializer.java	11.76% <11.76%> (ø)
...erializers/audit/FeederAuditDetailsSerializer.java	16.66% <16.66%> (ø)
.../text/serializers/audit/FeederAuditSerializer.java	20.00% <20.00%> (ø)
...dap/archie/text/serializers/SectionSerializer.java	22.22% <22.22%> (ø)
...alizers/demographic/PartyIdentifiedSerializer.java	22.22% <22.22%> (ø)
...erializers/demographic/PartyRelatedSerializer.java	22.22% <22.22%> (ø)
...e/text/serializers/datatypes/DvTimeSerializer.java	25.00% <25.00%> (ø)
...ap/archie/text/serializers/ItemListSerializer.java	28.57% <28.57%> (ø)
...xt/serializers/datatypes/DvIntervalSerializer.java	28.57% <28.57%> (ø)
...ext/serializers/datatypes/DvOrdinalSerializer.java	28.57% <28.57%> (ø)
... and 31 more

... and 1 file with indirect coverage changes

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