feat: add feature flags

Flags allow you to disable certain functionality and compile with only select features to reduce build time.

Resolves #54.

src/clients/mod.rs

@@ -1,4 +1,7 @@
+#[cfg(feature = "workspaces")]
 pub mod compositor;
+#[cfg(feature = "music")]
 pub mod music;
+#[cfg(feature = "tray")]
 pub mod system_tray;
 pub mod wayland;