Bump version to 1.0.0rc0

[talonchandler]

I have added a few changes to prepare for this waveorder release (after these changes waveorder's packaging matches recOrder):

• move all setup.py logic to a static setup.cfg file
• remove all requirements.txt files and by-hand installs in github actions---all requirements are now in setup.cfg
• version with git tags

---

Q: The old setup.py included the following PowerPC-specific logic that removed all dependencies:

if platform.machine() == 'ppc64le':
        requirements = []
else:
        requirements = ['numpy>=1.17.4', ... remaining requirements

Is there a reason that PowerPC doesn't need the requirements?

---

@ieivanov after review and merge I will add a tag and push to PyPI as version 1.1.0.

[talonchandler]

PS sorry for hijacking your branch here @ieivanov...I figured I'd synchronize recOrder's and waveorder's packaging before releasing and that led to the questions above. Thanks!

[talonchandler]

I've tagged 1d207aa (the tip of this branch) as 1.0.0rc0, released it, and recOrder's tests on this branch https://github.com/mehta-lab/recOrder/pull/148 are passing.

Merging both now.