feat: add feature flags

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

Resolves #54.

src/image/mod.rs

@@ -1,5 +1,7 @@
+#[cfg(any(feature = "music", feature = "workspaces"))]
 mod gtk;
 mod provider;
 
+#[cfg(any(feature = "music", feature = "workspaces"))]
 pub use self::gtk::*;
 pub use provider::ImageProvider;