This fixes some lag, when Nheko is running, which could affect Nheko and
even other applications by excessively calling fsync. This should be
fine, since all filesystems seem to guarantee order and in most cases,
the modified pages are still written. In the worst case we should only
lose the last /sync results or similar.

* add username error label, add word wrapping for error labels

* make lint

* last commits

* remove font, and remove some lambdas

* add QRegularExpression for regex

* improve review things

* add isModified() for checkFields()

* add check isModified() for  all fields in checkFields

* Update src/RegisterPage.cpp

Co-authored-by: DeepBlueV7.X <nicolas.werner@hotmail.de>

* remove emit call for showError

Co-authored-by: DeepBlueV7.X <nicolas.werner@hotmail.de>

fixed toggle weirdness in settings, after loads added setChecked for Toggles, and fix issues with startInTray