- Move PLUGIN_FILE_DESC to common.
- SCH_PLUGIN: rename Load -> LoadSchematicFile, Save -> SaveSchematicFile.
- Use PLUGIN_FILE_DESC and CanRead* in schematic plugins.
- Return none/unknown types from Find/GuessPluginType functions.
- Iterate over file types for file wildcards.
- Clean-up header checking in IO plugins.
- Use PCB plugin list in IO_MGR::GuessPluginTypeFromLibPath.
- Correctly find the library paths for new and old LTspice versions
- Use case insensitive comparison (store element names as lower case in the map)
- Better search paths
- Allow user to copy contents of LTspice "lib" folder to the same folder as file being imported
Partially addresses https://gitlab.com/kicad/code/kicad/-/issues/15061