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_protocol.cpp

@@ -28,6 +28,9 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
+// FIXME: Reenable LSP.
+#if 0
+
 #include "gdscript_language_protocol.h"
 
 #include "core/io/json.h"
@@ -303,3 +306,5 @@ GDScriptLanguageProtocol::GDScriptLanguageProtocol() {
 	set_scope("workspace", workspace.ptr());
 	workspace->root = ProjectSettings::get_singleton()->get_resource_path();
 }
+
+#endif