Unify install scripts for *nix/Windows

[akprasad]

See #51 , #36 for context. Ideally, we should have a single install script that all systems can use.

[akprasad]

@vbasky I think the way to go is to either:

1. Use Python everywhere.
2. Use Rust everywhere.

Slight preference to (1). Would love your help on this.

[vbasky]

@akprasad I am not quite well versed with Python. I'll try to unify this using Rust

[akprasad]

@vbasky sounds good! Send out early work as you have it so we can align on the direction.