- Adds a new module for handling indentation to bring everything together.
- Uses shiftwidth to replace initial tabs in snippets, this is closer to
what you would get if you were to type the snippet out by hand.
- Replaces code in SnippetUtil with common class.
- Replaces the code in launch() with the common class to properly, and
consistently indent the lines.
- Changes the tests to use shiftwidth instead of tabstop as per the bug.
- Fixes the indentation in python snippets to use tabs instead of spaces.
