api: separate out AWT dependent parts (2.x)

[bradh]

Motivation and Context

There is still a small amount of AWT usage in the API module that is blocking Android usage. It is mostly around BufferedImage, and is located in two areas - the EmbeddedImage support for ST 0903, and the ST 1909 metadata overlay.

This refactors the API module to avoid that. Its a breaking change, suited to 2.x.

Resolves #332.

The Android build support (#253) needs significantly more than this, but its a step forward.

Description

The ST 0903 embedded image becomes a byte array. The user can invoke ImageIO if needed.

The ST 1909 rendering support moves to a new module (api-awt).

I'm not tied to the module name or namespace - feel free to suggest or modify as required.

How Has This Been Tested?

Full build.
Tested overlay still works OK in the viewer application.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

Merging #338 (711564d) into 2.x (d1d84c5) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                2.x     #338      +/-   ##
============================================
- Coverage     89.91%   89.83%   -0.08%     
+ Complexity     4854     4818      -36     
============================================
  Files           518      516       -2     
  Lines         13237    13078     -159     
  Branches       1248     1245       -3     
============================================
- Hits          11902    11749     -153     
+ Misses         1293     1287       -6     
  Partials         42       42              

Flag	Coverage Δ
unittests-api	98.80% <100.00%> (+0.03%)	⬆️
unittests-api-ffmpeg	15.78% <ø> (ø)
unittests-core	98.49% <ø> (ø)
unittests-geoid	100.00% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../jmisb/api/klv/st1909/ST1909DateTimeFormatter.java	100.00% <ø> (ø)
.../org/jmisb/api/klv/st0903/vchip/EmbeddedImage.java	100.00% <100.00%> (+26.08%)	⬆️
...java/org/jmisb/api/awt/st1909/OverlayRenderer.java
...b/api/awt/st1909/OverlayRendererConfiguration.java

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