add input methdod framework (add sitelen pona input)

Also change audio player randomness source to /dev/urandom which is way better for the prng we are using

wm/src/input_method/lat.rs

@@ -0,0 +1,19 @@
+use ming_wm_lib::window_manager_types::InputMethod;
+use ming_wm_lib::messages::KeyPress;
+
+pub struct Lat {}
+
+impl InputMethod for Lat {
+  fn abbr(&self) -> [char; 3] {
+    ['L', 'A', 'T']
+  }
+
+  fn internal_buffer(&self) -> String {
+    String::new()
+  }
+
+  fn add_key_press(&mut self, kp: KeyPress) -> Option<char> {
+    //everything goes
+    Some(kp.key)
+  }
+}