4738 issue disable t2e

Closes e/backlog#4739

See merge request e/tools/easy-installer!143

Currently translated at 34.5% (87 of 252 strings)

Translation: /e//Easy Installer
Translate-URL: https://i18n.e.foundation/projects/e/easy-installer/gd/

Apply @nicofonk proposal for Dockerfile

See merge request e/tools/easy-installer!140

Refactor Command.java class

Closes #360

See merge request e/tools/easy-installer!137

Update docker file to use channel 5.x

See merge request e/tools/easy-installer!139

Currently translated at 100.0% (252 of 252 strings)

Translation: /e//Easy Installer
Translate-URL: https://i18n.e.foundation/projects/e/easy-installer/de/

remove unused method, unused import from many classes. Also replace ThreadFactory.getProcessMould() by Phone.getProcess()

remove MainWindowController 'flashed' property and related getters/setters as duplicate of device.flashed

remove FlashThread.java, IFlashHandler.java & a method in ThreadFactory to create a FlashThread. Those classes weren't used anymore