New GDScript tokenizer and parser

Sometimes to fix something you have to break it first.

This get GDScript mostly working with the new tokenizer and parser but
a lot of things isn't working yet. It compiles and it's usable, and that
should be enough for now.

Don't worry: other huge commits will come after this.

modules/gdscript/language_server/gdscript_language_server.cpp

@@ -28,6 +28,9 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
+// FIXME: Reenable LSP.
+#if 0
+
 #include "gdscript_language_server.h"
 
 #include "core/os/file_access.h"
@@ -114,3 +117,5 @@ void register_lsp_types() {
 	ClassDB::register_class<GDScriptTextDocument>();
 	ClassDB::register_class<GDScriptWorkspace>();
 }
+
+#endif