[ImGui] Add helper function "is_mouse_released"

Author: malikolivier

src/lib.rs

@@ -309,6 +309,12 @@ impl ImGui {
             sys::igIsMouseDoubleClicked(button as c_int)
         }
     }
+    /// Returns `true` if the `button` provided as argument was released
+    pub fn is_mouse_released(&self, button: ImMouseButton) -> bool {
+        unsafe {
+            sys::igIsMouseReleased(button as c_int)
+        }
+    }
     pub fn key_ctrl(&self) -> bool {
         let io = self.io();
         io.key_ctrl