Initial Prerelease

[WillJRoper]

This is the initial prerelease of Synthesizer and a test of the automatic versioning done with setuptools_scm. At this time, all major functionality works but there's still some foundational work to be done:

• Multicomponent spectra need a full implementation.
• Blackhole spectra need a full implementation.
• Spectral data cubes need fleshing out with analysis methods.
• Particle and Parametric classes needed expanded documentation.
• Emission and attenuation models need refining for ease of use.

Plus other smaller issues and changes.

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This discussion was created from the release Initial Pre-release.