Refactor messy qso form code into separate component.

[seporaitis]

Part of #1

This adds some structure to the qso form code and introduces some potential code style rules:

• things on screen will be called components
• components will live in their own files
• structures, enums will be named using lower camel case (e.g. qsoFormComponent)
• main structure holding the state of the component will be named accordingly (fooBarComponent)
• all components should have at least
  • newFooBarComponent that allocates memory for the component
  • initFooBarComponent that initializes the component
  • freeFooBarComponent that denitializes and frees up the memory held by component
• additional functions for component
  • refreshFooBarComponent - called just before the ncurses refresh/update.
  • processFooBarComponentInput - process input.