Add XWayland support (#16)

* save dev state

* fix xwayland-satellite supervisor lifecycle, readiness and cleanup

* remove wayland scanner protocol generated files

* default xwayland enabled with path

* remove jargons

* address x11 review: park unconfirmed cleanup, never signal a reaped group, fix storm test and notify dir mode

* fix resize tests: never build Size values from negative dimensions

* add min-width/min-height window rules that replace client minimum sizes

* rename effective_size_constraints to effective_minimum_size and minor cleanups

compositor/src/main.rs

@@ -32,6 +32,7 @@ mod render;
 mod resize_metrics;
 mod resize_transaction;
 mod resume;
+mod session_environment;
 mod session_lock;
 mod shell_control;
 mod stacking;
@@ -42,6 +43,9 @@ mod theme;
 mod wallpaper;
 mod window_rules;
 mod winit;
+mod xwayland;
+
+pub(crate) use session_environment::{SessionEnvironment, X11Environment};
 
 use std::error::Error;
 use std::io;
@@ -109,6 +113,8 @@ fn main() -> Result<(), Box<dyn Error>> {
     overview::init_font_loader(&mut event_loop, &mut state)?;
     backends::init(launch.backend, &mut event_loop, &mut state)?;
 
+    xwayland::initialize(&mut state);
+
     info!(socket = ?state.socket_name, backend = ?launch.backend, "Ferese is accepting Wayland clients");
 
     let child = spawn_client(&mut state, launch.client, launch.client_capabilities)
@@ -131,6 +137,8 @@ fn main() -> Result<(), Box<dyn Error>> {
         terminate_child(&mut child);
     }
 
+    xwayland::shutdown_after_loop(&mut state);
+
     result.map_err(Into::into)
 }