Ignore COM Ports selected by user

[DocMoebiuz]

Is your feature request related to a problem? Please describe. As a user I can tell MobiFlight to not connect to certain COM ports even though the boards are potentially compatible, but used by another application.

Describe the solution you'd like

• [x] User can add a port as text to a list of ignored ports
• [x] User can select an existing device (e.g. unknown device) and add / remove it to/from the list
• [x] The ignored ports are displayed on the MobiFlight modules page
• [x] If an ignore port is in use, the port is also displayed in the tree view
• [x] UI translation
• [ ] Documentation updated

Describe alternatives you've considered

• Provide information in a config file

Additional context The following issues are related or are implemented by this issue:

• #551
• #672