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/lsp.hpp

@@ -31,6 +31,9 @@
 #ifndef GODOT_LSP_H
 #define GODOT_LSP_H
 
+// FIXME: Reenable LSP.
+#if 0
+
 #include "core/class_db.h"
 #include "core/list.h"
 #include "editor/doc_data.h"
@@ -1785,3 +1788,5 @@ static String marked_documentation(const String &p_bbcode) {
 } // namespace lsp
 
 #endif
+
+#endif