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/10-labels.otui

@@ -0,0 +1,65 @@
+Label < UILabel
+  font: verdana-11px-antialised
+  color: #bbbbbb
+
+  $disabled:
+    color: #bbbbbb88
+
+FlatLabel < UILabel
+  font: verdana-11px-antialised
+  color: #aaaaaa
+  size: 86 20
+  text-offset: 3 3
+  image-source: /images/ui/panel_flat
+  image-border: 1
+
+  $disabled:
+    color: #aaaaaa88
+
+MenuLabel < Label
+
+GameLabel < UILabel
+  font: verdana-11px-antialised
+  color: #bbbbbb
+
+FrameCounterLabel < Label
+  font: verdana-11px-rounded
+  @onSetup: |
+    self.updateEvent = cycleEvent(function()
+      local text = 'FPS: ' .. g_app.getBackgroundPaneFps()
+      self:setText(text)
+    end, 1000)
+  @onDestroy: self.updateEvent:cancel()
+
+PingLabel < Label
+  font: verdana-11px-rounded
+  @onSetup: |
+    self.updateEvent = cycleEvent(function()
+      if g_game.isOnline() and modules.client_options.getOption('showPing') then
+        local ping = -1
+        if g_game.getFeature(GameClientPing) or g_game.getFeature(GameExtendedClientPing) then
+          ping = g_game.getPing()
+        else
+          ping = g_game.getLocalPlayer():getWalkPing()
+        end
+        local text = 'Ping: '
+        if ping < 0 then
+          text = text .. "??"
+          self:setColor('yellow')
+        else
+          text = text .. ping .. ' ms'
+          if ping >= 500 then
+            self:setColor('red')
+          elseif ping >= 250 then
+            self:setColor('yellow')
+          else
+            self:setColor('green')
+          end
+        end
+        self:setText(text)
+        self:show()
+      else
+        self:hide()
+      end
+    end, 1000)
+  @onDestroy: self.updateEvent:cancel()