Implement better error system and segregate errors and commands (#23)

* chore: Progress on amend_settings command

Signed-off-by: quexeky <git@quexeky.dev>

* chore(errors): Progress on better error handling with segragation of files

* chore: Progress on amend_settings command

Signed-off-by: quexeky <git@quexeky.dev>

* chore(commands): Separated commands under each subdirectory into respective commands.rs files

Signed-off-by: quexeky <git@quexeky.dev>

* chore(errors): Almost all errors and commands have been segregated

* chore(errors): Added drop server error

Signed-off-by: quexeky <git@quexeky.dev>

* feat(core): Update to using nightly compiler

Signed-off-by: quexeky <git@quexeky.dev>

* chore(errors): More progress on error handling

Signed-off-by: quexeky <git@quexeky.dev>

* chore(errors): Implementing Try and FromResidual for UserValue

Signed-off-by: quexeky <git@quexeky.dev>

* refactor(errors): Segregated errors and commands from code, and made commands return UserValue struct

Signed-off-by: quexeky <git@quexeky.dev>

* fix(errors): Added missing files

* chore(errors): Convert match statement to map_err

* feat(settings): Implemented settings editing from UI

* feat(errors): Clarified return values from retry_connect command

* chore(errors): Moved autostart commands to autostart.rs

* chore(process manager): Converted launch_process function for games to use game_id

---------

Signed-off-by: quexeky <git@quexeky.dev>

src-tauri/src/remote/remote.rs

@@ -0,0 +1,49 @@
+use std::{
+    error::Error,
+    fmt::{Display, Formatter},
+    sync::{Arc, Mutex},
+};
+
+use http::StatusCode;
+use log::{info, warn};
+use serde::Deserialize;
+use url::{ParseError, Url};
+
+use crate::{error::remote_access_error::RemoteAccessError, AppState, AppStatus, DB};
+
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct DropHealthcheck {
+    app_name: String,
+}
+
+pub fn use_remote_logic(
+    url: String,
+    state: tauri::State<'_, Mutex<AppState<'_>>>,
+) -> Result<(), RemoteAccessError> {
+    info!("connecting to url {}", url);
+    let base_url = Url::parse(&url)?;
+
+    // Test Drop url
+    let test_endpoint = base_url.join("/api/v1")?;
+    let response = reqwest::blocking::get(test_endpoint.to_string())?;
+
+    let result: DropHealthcheck = response.json()?;
+
+    if result.app_name != "Drop" {
+        warn!("user entered drop endpoint that connected, but wasn't identified as Drop");
+        return Err(RemoteAccessError::InvalidEndpoint);
+    }
+
+    let mut app_state = state.lock().unwrap();
+    app_state.status = AppStatus::SignedOut;
+    drop(app_state);
+
+    let mut db_state = DB.borrow_data_mut().unwrap();
+    db_state.base_url = base_url.to_string();
+    drop(db_state);
+
+    DB.save().unwrap();
+
+    Ok(())
+}