Adding a dark theme for the Firestorm Skin. Changes the Background of TextFields and some highlighting colors.

indra/newview/skins/firestorm/themes/dark/colors.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
+<colors>
+ 
+	<color
+	 name="TextFgColor"             
+	 value="1.0 1.0 1.0 1.0" />
+	 
+</colors>

indra/newview/skins/firestorm/themes/dark/xui/en/widgets/line_editor.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
+<line_editor background_image="TextField_Off"
+             background_image_disabled="TextField_Disabled"
+             background_image_focused="TextField_Active"
+             select_on_focus="false"
+             commit_on_focus_lost="true"
+             ignore_tab="true"
+             cursor_color="TextCursorColor"
+             text_color="TextFgColor"
+			 text_pad_left="2"
+             text_readonly_color="TextFgReadOnlyColor"
+             text_tentative_color="TextFgTentativeColor"
+			 highlight_color="White"
+			 preedit_bg_color="Black"
+             mouse_opaque="true"
+             name="line_editor"
+             font="SansSerifSmall">
+</line_editor>

indra/newview/skins/skins.xml

@@ -13,6 +13,12 @@
                 <key>folder</key>
                     <string>grey</string>
                 </map>
+                <map>
+                <key>name</key>
+                    <string>Dark</string>
+                <key>folder</key>
+                    <string>dark</string>
+                </map>
             </array>
         </map>