Windows fix process env vars (#96)

* fixes windows issue

* clippy

theseus/src/launcher/mod.rs

@@ -232,11 +232,12 @@ pub async fn launch_minecraft(
             .collect::<Vec<_>>(),
         )
         .current_dir(instance_path.clone())
-        .env_clear()
-        .envs(env_args)
         .stdout(Stdio::piped())
         .stderr(Stdio::piped());
 
+    // Clear cargo-added env varaibles for debugging, and add settings env vars
+    clear_cargo_env_vals(&mut command).envs(env_args);
+
     // Create Minecraft child by inserting it into the state
     // This also spawns the process and prepares the subsequent processes
     let mut state_children = state.children.write().await;
@@ -249,3 +250,12 @@ pub async fn launch_minecraft(
         )
         .await
 }
+
+fn clear_cargo_env_vals(command: &mut Command) -> &mut Command {
+    for (key, _) in std::env::vars() {
+        if key.starts_with("CARGO") {
+            command.env_remove(key);
+        }
+    }
+    command
+}