**CustomModelsSelector**
- Update link to task file (offline session)
- Sort and filter task types
- Fix selector by row
- Add support for checkpoints with config file
**PretrainedModelsSelector**
- Add sorting flag. If True models will be sorted by name, else by index in table
- Rework filtering and sorting. 1st filter by task type, then by architecture type
- Add methods get_available_task_types(), get_available_arch_types()
- Update get_selected_row() method
- Add support for checkpoints with config file