Gwent

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* Removed vendored gwinc and switched to pip install
* Switched install to pyproject.toml not setup.py
* Only supporting python 3.7 and up
* Testing and linting changes

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* Adding functionality to use lalsuite waveforms
* Changing locations of multiple functions from BBHFrequencyDomain functions to general binary functions
* Moved several functions from binary to waveform
* Fixed several bugs with SNR calculations
* Clarified certain constants
* Added JOSS paper draft
* Expanded testing and switched from TravisCI to Github Actions

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* Turning pygwinc install into vendor inside gwent

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* Update to ground-based SNR calculation
* Minor changes to snrplot functionality
* Changed fitting for WD background
* Misc bug fixing

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* Major Changes to PTA detector setup
* Major Changes to snrplot
* Overhaul of tutorials
* Minor Changes to binary and snr functions
* Other Minor Changes sprinkled throughout

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* Removing install of pygwinc in setup.py
* pygwinc must now be manually installed