change interface style, add top menu

modules/core_ui/styles/buttons.otui

@@ -22,3 +22,30 @@ Button < UIButton
   state.disabled:
     color: #999999
     background-color: #ffffff88
+
+TopButton < UIButton
+  background-color: white
+  size: 26 25
+  text-translate: 0 0
+  border-image:
+    source: /core_ui/images/top_button.png
+    size: 26 25
+    border: 3
+
+  state.hover:
+    border-image:
+      source: /core_ui/images/top_button.png
+      size: 26 25
+      offset: 26 0
+      border: 3
+
+  state.pressed:
+    text-translate: 1 1
+    border-image:
+      source: /core_ui/images/top_button.png
+      size: 26 25
+      offset: 52 0
+      border: 3
+
+  state.disabled:
+    background-color: #ffffff66

modules/core_ui/styles/panels.otui

@@ -1,10 +1,16 @@
 Panel < UIWidget
+  phantom: true
 
 FlatPanel < Panel
   border-image:
     source: /core_ui/images/panel_flat.png
     border: 4
 
+TopPanel < Panel
+  height: 34
+  border-image:
+    source: /core_ui/images/top_panel.png
+    border-bottom: 3
 
 RoundedPanel < Panel
   background-color: #ffffffdd

modules/core_ui/styles/separators.otui

@@ -3,3 +3,4 @@ HorizontalSeparator < UIWidget
     source: /core_ui/images/horizontal_separator.png
     border.top: 2
   height: 2
+  phantom: true