Add Genie programming language (#3396)

* Add Genie programming language

Genie was introduced in 2008 as part of the GNOME project:
https://wiki.gnome.org/Projects/Genie

It is a programming language that uses the Vala compiler to
produce native binaries. It has good bindings to C libraries
especially those that are part of the GObject world such as
Gtk+3 and GStreamer

* Change color for Genie so tests pass

lib/linguist/languages.yml

@@ -1385,6 +1385,14 @@ Game Maker Language:
   codemirror_mode: clike
   codemirror_mime_type: text/x-c++src
   language_id: 125
+Genie:
+  type: programming
+  ace_mode: text
+  extensions:
+  - ".gs"
+  color: "#fb855d"
+  tm_scope: none
+  language_id: 792408528
 Genshi:
   type: programming
   extensions:

samples/Genie/Class.gs

@@ -0,0 +1,12 @@
+init
+	new Demo( "Demonstration class" ).run()
+
+class Demo
+	_message:string = ""
+
+	construct ( message:string = "Optional argument - no message passed in constructor" )
+		_message = message
+
+	def run()
+		print( _message )
+		

samples/Genie/Hello.gs

@@ -0,0 +1,2 @@
+init
+	print( "Hello, World!" )