Transaction management - Githubissues

Changes include:

Replacing the Quickstep parser, resolver, and optimizer with a SQLite3 language parser and a resolver module.
Re-organizing Hustle into a client-server architecture with TCP communication.
Separating each module into its own thread. Interfaces between modules are message channels.
Completing the serializing transaction manager.

UWHustle / hustle-in-Rust-now-defunct