Fixed styling issues for various elements that weren't being applied via settings. (#118)

* Popups are now styles properly and can be themed. closes #115

* Added the ability to style media menu card color and transparency. Made confirmation dialogue optional.

* Increase radius

* Move actions inside the function to reflect updated values.

scss/style/common/general.scss

@@ -0,0 +1,26 @@
+@import '../colors.scss';
+
+window.popup {
+  menuitem {
+    label {
+      color: $bar-menus-popover-text;
+    }
+
+    &:hover {
+      background-color: transparentize($bar-menus-popover-text, 0.6);
+    }
+  }
+
+  menu {
+    background: $bar-menus-popover-background;
+  }
+
+  separator {
+    background: transparentize($bar-menus-popover-text, 0.7);
+    min-height: 0.075em;
+  }
+
+  arrow {
+    color: $bar-menus-popover-text;
+  }
+}