initial mask impl

src/core/mod.rs

@@ -1,4 +1,5 @@
 mod image;
+mod mask;
 mod position;
 mod rect;
 mod sense;
@@ -6,6 +7,7 @@ mod text;
 mod trait_fns;
 
 pub use image::*;
+pub use mask::*;
 pub use position::*;
 pub use rect::*;
 pub use sense::*;