Fix or workaround recent extension API compatibility issues

- Add compatibility methods for `RenderingDevice::shader_create_from_bytecode`
  and `CodeEdit::get_text_for_symbol_loopup`.
- Silence errors which now have compatibility methods.
- Acknowledge GraphEdit/GraphNode compat breakage, intended and WIP.

misc/scripts/clang_format.sh

@@ -21,7 +21,7 @@ fi
 
 # Fix copyright headers, but not all files get them.
 for f in $files; do
-    if [[ "$f" == *"inc" ]]; then
+    if [[ "$f" == *"inc" && "$f" != *"compat.inc" ]]; then
         continue
     elif [[ "$f" == *"glsl" ]]; then
         continue