[IZPACK-1090] Allow tab completion and password masking in console mode
- Falling back to read lines from standard input instead of failing the installation if ConsoleReader initialization fails ClassNotFoundException (occurs when the JNI DLL loading/initialization fails) (TODO: stabilize initialization on Windows)
- Suppress JLine logging completely for now (TODO: connect it to IzPack logging)
- Small cleanups
Merge pull request #240 from rkrell/IZPACK-1090

[IZPACK-1090] Allow tab completion and password masking in console mode