Modifies int validator, deprecates get_filename_by_path

Integer input function instead.

Deprecates get_filename_by_path as pathlib's .stem can handle returns for filename without extension, and .name can handle returns for filename with extension.

Adding in int validator.

Added in integer entry and validator.

Initial Release

Initial Release. A package of functions that I keep using but rewriting each time. This way I don't deal with that crap anymore.