Feature clip round 12bit jpeg

[dugalh]

Features:

• Round and clip to dtype range when it is integer.
• Write internal mask when nodata is None.
• Allow 12bit JPEG input / output files.
• Cache RasterArray mask.
• Issue warnings rather than log them.

Fixes:

• Allow --nodata before --dtype on CLI.

Docs:

• Expand CLI 'Output file format' section.
• Add 'Contributing' section.

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (4bbbe1d) 95.80% compared to head (63d0954) 96.12%.

Files	Patch %	Lines
homonim/raster_array.py	93.02%	3 Missing ⚠️
homonim/cli.py	93.75%	2 Missing ⚠️
homonim/raster_pair.py	90.90%	1 Missing ⚠️
homonim/utils.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #3      +/-   ##
==========================================
+ Coverage   95.80%   96.12%   +0.32%     
==========================================
  Files          13       13              
  Lines        1429     1471      +42     
==========================================
+ Hits         1369     1414      +45     
+ Misses         60       57       -3     

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