Removal of timezone logic

As discussed in [a recent commit](https://github.com/wonderb0lt/ugrm/commit/1219ca617eaa6bfc62f553b473ef9302c44d78ad) and [UGRM #11](https://github.com/coderbyheart/ugrm/issues/11), I've removed the timezone logic from the repository and removed existing timezones from all XML files.