When XCA started in 2002, there were no C++ initializers.
Drop explicit initializers from the constructors.
- Fix indentations of section declarators.
- Replace NULL by nullptr when feasible.
- Sort private section: properties first, then methods.
change storage type of passwords from char[] to QByteArray
Create PwDialog class and drop passWrite and passRead
Create Passwd class derived from QBytearray
move PKCS12 password input to PwDialog