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/fonts/sans-bold-16px.otfont

@@ -0,0 +1,6 @@
+Font
+  name: sans-bold-16px
+  texture: sans-bold-16px_cp1252
+  height: 20
+  glyph-size: 24 24
+  space-width: 3

data/fonts/terminus-14px-bold.otfont

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+Font
+  name: terminus-14px-bold
+  texture: terminus-14px-bold
+  height: 16
+  y-offset: 2
+  glyph-size: 16 16
+  fixed-glyph-width: 8
+  space-width: 8

data/fonts/verdana-11px-antialised.otfont

@@ -0,0 +1,7 @@
+Font
+  name: verdana-11px-antialised
+  texture: verdana-11px-antialised_cp1252
+  height: 14
+  glyph-size: 16 16
+  space-width: 4
+  default: true

data/fonts/verdana-11px-monochrome.otfont

@@ -0,0 +1,6 @@
+Font
+  name: verdana-11px-monochrome
+  texture: verdana-11px-monochrome_cp1252
+  height: 14
+  glyph-size: 16 16
+  space-width: 3

data/fonts/verdana-11px-rounded.otfont

@@ -0,0 +1,8 @@
+Font
+  name: verdana-11px-rounded
+  texture: verdana-11px-rounded_cp1252
+  height: 16
+  glyph-size: 16 16
+  y-offset: -2
+  spacing: -1 -3
+  space-width: 4