Add scss colors into rust via build-script, flesh out math evaluation in launcher, Restructure some code

src/backend/commands.rs

@@ -1,7 +1,7 @@
 use crate::LOGGER;
 use crate::backend::{BackendThread, SimpleBackendThread};
-use crate::ctl::{ControlCommand, SOCKET_PATH};
 use crossbeam_channel::{Receiver, Sender};
+use jmb_bar::{ControlCommand, SOCKET_PATH};
 use jmb_logger_rs::*;
 use std::io::Read;
 use std::net::Shutdown;