Moved FontAwesome css into vendor folder & use cssrewrite filter for webassets

That fixes up the relative URLs to the font files and should make updates down the line
a thing of a quick copy and paste (plus allow some more sophisticated dependency
management down the road as well).

Also renamed fonts folder for FontAwesome 3.2.1 from font to fonts, for more
consistency.

src/octoprint/server/__init__.py

@@ -1100,8 +1100,8 @@ class Server(object):
 			"css/bootstrap-modal.css",
 			"css/bootstrap-slider.css",
 			"css/bootstrap-tabdrop.css",
-			"css/font-awesome3.min.css",
-			"css/font-awesome.min.css",
+			"assets/vendor/font-awesome-3.2.1/css/font-awesome.min.css",
+			"assets/vendor/font-awesome-4.7.0/css/font-awesome.min.css",
 			"css/jquery.fileupload-ui.css",
 			"css/pnotify.core.min.css",
 			"css/pnotify.buttons.min.css",
@@ -1156,7 +1156,7 @@ class Server(object):
 		js_app_bundle = Bundle(js_plugins_bundle, js_core_bundle, output="webassets/packed_app.js", filters="js_delimiter_bundler")
 
 		# CSS
-		css_libs_bundle = Bundle(*css_libs, output="webassets/packed_libs.css")
+		css_libs_bundle = Bundle(*css_libs, output="webassets/packed_libs.css", filters="cssrewrite")
 
 		if len(css_core) == 0:
 			css_core_bundle = Bundle(*[])

src/octoprint/static/assets/vendor/font-awesome-3.2.1/css/font-awesome.css

@@ -27,8 +27,8 @@
  * -------------------------- */
 @font-face {
   font-family: 'FontAwesome3';
-  src: url('../assets/vendor/font-awesome-3.2.1/font/fontawesome-webfont.eot?v=3.2.1');
-  src: url('../assets/vendor/font-awesome-3.2.1/font/fontawesome-webfont.eot?#iefix&v=3.2.1') format('embedded-opentype'), url('../assets/vendor/font-awesome-3.2.1/font/fontawesome-webfont.woff?v=3.2.1') format('woff'), url('../assets/vendor/font-awesome-3.2.1/font/fontawesome-webfont.ttf?v=3.2.1') format('truetype'), url('../assets/vendor/font-awesome-3.2.1/font/fontawesome-webfont.svg#fontawesomeregular?v=3.2.1') format('svg');
+  src: url('../fonts/fontawesome-webfont.eot?v=3.2.1');
+  src: url('../fonts/fontawesome-webfont.eot?#iefix&v=3.2.1') format('embedded-opentype'), url('../fonts/fontawesome-webfont.woff?v=3.2.1') format('woff'), url('../fonts/fontawesome-webfont.ttf?v=3.2.1') format('truetype'), url('../fonts/fontawesome-webfont.svg#fontawesomeregular?v=3.2.1') format('svg');
   font-weight: normal;
   font-style: normal;
 }
@@ -49,7 +49,7 @@
   display: inline-block;
   speak: none;
 }
-/* makes the font 33% larger relative to the icon container */
+/* makes the fonts 33% larger relative to the icon container */
 .icon-large:before {
   vertical-align: -10%;
   font-size: 1.33333333em;
@@ -59,7 +59,7 @@ a [class^="icon-"],
 a [class*=" icon-"] {
   display: inline;
 }
-/* increased font size for icon-large */
+/* increased fonts size for icon-large */
 [class^="icon-"].icon-fixed-width,
 [class*=" icon-"].icon-fixed-width {
   display: inline-block;

src/octoprint/static/assets/vendor/font-awesome-4.7.0/css/font-awesome.css

@@ -6,8 +6,8 @@
  * -------------------------- */
 @font-face {
   font-family: 'FontAwesome';
-  src: url('../assets/vendor/font-awesome-4.7.0/fonts/fontawesome-webfont.eot?v=4.7.0');
-  src: url('../assets/vendor/font-awesome-4.7.0/fonts/fontawesome-webfont.eot?#iefix&v=4.7.0') format('embedded-opentype'), url('../assets/vendor/font-awesome-4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0') format('woff2'), url('../assets/vendor/font-awesome-4.7.0/fonts/fontawesome-webfont.woff?v=4.7.0') format('woff'), url('../assets/vendor/font-awesome-4.7.0/fonts/fontawesome-webfont.ttf?v=4.7.0') format('truetype'), url('../assets/vendor/font-awesome-4.7.0/fonts/fontawesome-webfont.svg?v=4.7.0#fontawesomeregular') format('svg');
+  src: url('../fonts/fontawesome-webfont.eot?v=4.7.0');
+  src: url('../fonts/fontawesome-webfont.eot?#iefix&v=4.7.0') format('embedded-opentype'), url('../fonts/fontawesome-webfont.woff2?v=4.7.0') format('woff2'), url('../fonts/fontawesome-webfont.woff?v=4.7.0') format('woff'), url('../fonts/fontawesome-webfont.ttf?v=4.7.0') format('truetype'), url('../fonts/fontawesome-webfont.svg?v=4.7.0#fontawesomeregular') format('svg');
   font-weight: normal;
   font-style: normal;
 }
@@ -19,7 +19,7 @@
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
 }
-/* makes the font 33% larger relative to the icon container */
+/* makes the fonts 33% larger relative to the icon container */
 .fa-lg {
   font-size: 1.33333333em;
   line-height: 0.75em;