Fix conflict with TreeStyleTab addon.
Fix conflict with TreeStyleTab addon.

- See https://github.com/piroor/treestyletab/issues/164
  Explicitly specify scope of `toggleSidebar` to prevent function
  undefined error.
- Add FunctionWithNoise/FunctionWithoutNoise to make alias functions
  more clearer.
- Use `in` operator instead of `===`.

bootleq/Noise,bootleq/Noise