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-tables.otui

@@ -0,0 +1,26 @@
+Table < UITable
+  layout: verticalBox
+  header-column-style: HeaderTableColumn
+  header-row-style: HeaderTableRow
+  column-style: TableColumn
+  row-style: TableRow
+
+TableData < UIScrollArea
+  layout: verticalBox
+
+TableRow < Label
+  layout: horizontalBox
+  height: 10
+  text-wrap: true
+
+TableColumn < Label
+  width: 30
+  text-wrap: true
+
+TableHeaderRow < Label
+  layout: horizontalBox
+  height: 10
+  text-wrap: true
+
+TableHeaderColumn < Button
+  width: 30