Refactor modules, closes #223

* All modules are sandboxed now
* All images,sounds,fonts,translations and styles were moved to "data" folder
* Reorganize image files folders
* Remove unmaintained modules: client_particles, client_shaders
* Implement new automatic way to load styles and fonts
* Add hide/show offline option in VipList
* Add invite/exclude to/from private channel in players menus
* Many other minor changes

data/styles/20-topmenu.otui

@@ -0,0 +1,49 @@
+TopButton < UIButton
+  size: 26 26
+  image-source: /images/ui/button_top
+  image-clip: 0 0 26 26
+  image-border: 3
+  image-color: #ffffffff
+  icon-color: #ffffffff
+
+  $hover !disabled:
+    image-color: #ffffff99
+    image-clip: 26 0 26 26
+
+  $pressed:
+    image-clip: 52 0 26 26
+
+  $disabled:
+    image-color: #ffffff44
+    icon-color: #ffffff44
+
+TopToggleButton < UIButton
+  size: 26 26
+  image-source: /images/ui/button_topgame
+  image-clip: 26 0 26 26
+  image-color: #ffffffff
+  image-border: 3
+  icon-color: #ffffffff
+
+  $on:
+    image-clip: 0 0 26 26
+    image-color: #ffffffff
+    icon-color: #ffffffff
+
+TopMenuButtonsPanel < Panel
+  layout:
+    type: horizontalBox
+    spacing: 4
+    fit-children: true
+  padding: 6 4
+
+TopMenuPanel < Panel
+  height: 36
+  image-source: /images/ui/panel_top
+  image-repeated: true
+  focusable: false
+
+TopMenuFrameCounterLabel < FrameCounterLabel
+  color: white
+  margin-top: 4
+  margin-left: 5