* firmware installer
* Add directory installation option and fix 9.x support for directory
* Fix missing system font error while installing for the first time
* Address code style comments
* Create and use InvalidFirmwarePackageException
* Fix LDj3SNuD's comments
* addressed alex's comments
* add label to status bar to show current firmware version
Co-authored-by: Thog <thog@protonmail.com>
