studio - resolved z-index issue with release date modal and JQUI timepicker + conslidated all vendor styling overrides/extensions

cms/static/sass/base-style.scss

@@ -27,7 +27,7 @@
 @import 'elements/forms';
 @import 'elements/modal';
 @import 'elements/alerts';
-@import 'elements/jquery-ui-calendar';
+@import 'elements/vendor';
 @import 'elements/tender-widget';
 
 // specific views

cms/static/sass/elements/_vendor.scss

@@ -1,6 +1,7 @@
-// studio - elements - JQUI calendar
+// studio - elements - vendor overrides
 // ====================
 
+// JQUI calendar
 .ui-datepicker {
   border-color: $darkGrey;
   border-radius: 2px;
@@ -54,4 +55,11 @@
     border-color: $orange;
     color: #fff;
   }
+}
+
+// ====================
+
+// JQUI timepicker
+.ui-timepicker-list {
+  z-index: 100000 !important;
 }