This makes a number of internal improvements to the docker build process.

* A common build base

This common build base utilizes the dependency list outlined in `/dependencies` for both yum and pip, with the exception of cu-gr and dr-cu which use an... interesting (read: obtuse) build system. Speaking of...

* A pre-compile dependency list

This allows for the installing of dependencies that may need to be needed to compile *other* dependencies, incl. wheel, pyinstaller, devtoolset, etc.

* Builds now use tarballs

Git is no longer used, saving us the time needed to check out the *entire commit history every single time we build.* To handle submodules, I wrote a special script. Only OpenROAD uses submodules anyhow.

* Rewrote final image

The final image's Dockerfile was a mess. The new one also uses the dependency list and is better organized.

* OpenLane is now mounted to `/openlane` instead of `/openLANE_flow`

We don't really use `openLANE`, branding was settled on `OpenLane`, except I think it's better for everyone's sanity if I avoid capital letters altogether.