Pre-Release 3.0.0a4

[Argmaster]

PyGerber version 3.0.0a4 will continue incremental changes on top of 3.0.0a3.
There are still some breaking changes to be introduced (see list below). I will try to squish them into this release, then we can start beta development phase.

Changelog:

• Relaxed pyparsing dependency requirements to allow for use of 3.2 and above for
  supported Python versions.
• Relaxed numpy dependency requirements to allow for use of 2.x and above for
  supported Python versions.
• Relaxed pydantic dependency requirements to allow for use of 2.x and above for
  supported Python versions.
• Relaxed pillow dependency requirements to allow for use of 8.x and above for
  supported Python versions.
• Relaxed click dependency requirements to allow for use of 8.x and above for
  supported Python versions.
• Relaxed Python version requirement to allow for use of 3.8 and above.
• Removed pygerber.sequence_tools module.
• Removed pygerber.frozen_general_model module.
• Removed pygerber.gerber.linter.diagnostic module.
• Removed pygerber.warnings module.
• Updated documentation links to point to stable release documentation.
• Renamed GerberX3Builder.add_trace() to GerberX3Builder.add_line_trace() to be consistent with GerberX3Builder.add_clockwise_arc_trace() and GerberX3Builder.add_counter_clockwise_arc_trace().
• Added support for Altium implied leading zeros omitted. Contributed by @sjgallagher2 in Add support for Altium implied leading zeros omitted #340.
• Added arc drawing in GerberX3Builder.
• Added region statement generation to GerberX3Builder.

Issues pending for 3.0.0:

• PyGerber 3.0.0 comment attributes handling #297
• Rendering can't just fail when Gerber file is empty #313

Known TODO:

• Remove frozen general model class
• Add unit tests for pygments highlighting
• Add unit tests for handling invalid syntax in different contexts
• Add unit tests for file type detection in GerberFile class
• Remove sequence_tools.py
• Add pragma no cover to __main__.py
• Add render_with_shapely to CompositeView class
• Rename AM_close and alike to AMclose for consistency
• Add plugin mechanism for pygerber_gerber_parser_cpp
• Change ast structure to avoid nesting coordinates in D codes
• Split pygerber.gerber.ast.other.coordinate into separate modules for X, Y, I, J
• Adding metadata to Shape objects for VM
• Fix inconsisten order of box and origin in create_eager_layer and create_deferred_layer
• 95%+ coverage (determine which parts need tests)
• Move E2E formatter tests out of test/gerberx3/test_formatter.py
• Add single quadrant arc support
• Implement incremental coordinates (beta?)
• Ignore negative draws in box calculation (VM)
• Move assets/generated to assets/gerberx3/generated
• Move unit tests to test/unit/
• Add svg vm (beta?)
• Add svg vm tests (beta?)
• Add ogl/vk vm (beta?)
• Add ogl/vk vm tests (beta?)
• Update command line interface to use new tools
  • Trash the old desing
  • Implement with new APIs
  • Add tests
• Ensure correct re-exports from subpackages
• Add docs for RVMC builder API (beta?)
• Update reference assets
• Add automatic checking against reference files to E2E tests
• Use svglib + reportlab for SVG dumping as PNG files
• Add native tokenizer (beta?)
• Add POC optimizer pass (beta?)
• Language server - add diagnostics
• Separate E2E and Unit tests in CI
• Add arc drawing to AST builder
• Add block creation to AST builder
• Add step repeat creatio to AST builder
• Add region creation to AST builder
• Add missing RVMC builder features
• For Release change "Development Status :: 3 - Alpha" to Development Status :: 4 - Beta then Development Status :: 5 - Production/Stable
• Update feature support docs
• Add contribution guidelines
• Add Gerber Json projects support
• Add PyGerber 2.x.x -> 3.x.x migration guide
• Add reference assets for e2e tests
• 3D model generation?