Release 4.2.1

This is a bug-fix release.

Updated translations. Thanks once again to all those contributing as per Translations.
PLUGINS.md: Clarify when CargoJSON is populated.
macOS: pip install -r requirements.txt will now include pyobjc so that running this application works at all. Check the updated Running from source for some advice if attempting to run on macOS.
JournalLock: Handle when the Journal directory isn't set at all, rather than erroring. Fixes #910 - Not launching (Linux).
Extra logging added to track down cause of #909 - Authentication not possible (PC). The debug log file might now indicate what's wrong, or we might need you to run
```
"c:\Program Files (x86)\EDMarketConnector/EDMarketConnector.exe" --trace
```
in order to increase the log level and gather some extra information. Caution is advised if sharing a --trace log file as it will now contain
some of the actual auth data returned from Frontier.
Ensure that 'Save Raw Data' will work. Fixes #908 - Raw export of CAPI data broken.
Prevent EDDN plugin from erroring when we determine if the commander has Horizons. Fixes #907 - Modules is a list not a dict on damaged stations

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