Console runner is deplorable

[baratgabor]

Rewrite the console runner project to offer some actual, proper console functionality.

• At the very least it should accept string parameters to build the suffix tree from.
  • Also expose requesting to return the longest common substring, since that's a common use case of these algorithms, and building that tree in the first place should have some practical use.
• Ideally it should also have an interactive mode, and expose:
  • Adding new strings to the suffix tree.
  • Search for strings in the built suffix tree.
  • Display longest repeated substring.
• Measure and display tree build time with stopwatch.