IO improvements

[kbond]

Brainstorm of possible improvements to IO:

1. IO::cursor(): Cursor (or some kind of wrapper to help with cursor adjustments in a fluid way)
2. IO::color(): Color
3. IO::createSection(): ConsoleSectionOutput
4. IO::createSection(): self|IOSection alternative to above that returns either a new instance of IO wrapping ConsoleSectionOutput or some kind of helper wrapper
5. Non-final constructor to allow customization (ie add output formatter styles)
6. Implement StyleInterface instead of extending SymfonyStyle to allow different implementations (ie SymfonyIO) or configurable style "mixins"