Cleanup TODOs
Cleanup TODOs

- Removed TODOs about Windows line endings.

  This will not cause issues if read skips only one character,
  and bumps the line ending counter only on \n characters.

- Removed useless TODOs with implementation details.

- Removed TODOs for 'test improvement' because this will never
  be read and done in time. Code coverage is okay currently.

ilammy/sash