Kicost

Fixed
- Problems when trying to use Digi-Key API, but not available
- Progress bar in the GUI not working for Python 3.10+

Fixed
- Mouser API problems for languages other than english (always No Stock)
- KitSpace API encoding issues (UTF-8 as ISO-8859-1)

Added
- Digi-Key API
- Mouser API
- Farnell/Newark API (Element14)
- TME API
- Cache for all APIs (including KitSpace and Octopart)

Added
- The user custom field capability to order quote
- Cell size adjust algorithm (use --max_column_width 0 to disable it)
- `pricing` processing for subparts.
- Now the spreadsheet doesn't need to be recomputed after loading.
- `--split_extra_fields` to specify more fields to split for subparts.
- `--board_qty` to specify the number of boards.
- `--force_en_us` to workaround wxWidgets issues.

Fixed
- The Farnell import code order
- LCSC link and add BOM import links of all
- Reference sorting and crashes