Edited Batch scipt with regex support

[NP-Gaming]

Added an alternative batch script that uses regex to identify episode IDs (S00E00). This ensures reliable linking without requirement of same filenames.

This is a modified version of script provided by @stinkybread in #1 (comment).

This script should not be a replacement, but rather an addition to expand this project's functionality.

How does it work:

1. Imports re library.
2. This version of script differs that at start it loads list of video-files from both reference and foreign directory, not only reference. Then both lists are parsed using regex and saved into dictionaries as {Episode_ID : filename}, if there is same episode id detected multiple times, the script exits to prevent wrong matching of files.
3. Using set intersection of sets created from dictionary keys (episode ids) creates a list of files that have a pair (i.e. are ready to be synced)
4. Script proceeds as original

Few minor changes:

• Skipped count is calculated as number of video-files in reference directory - number of pairs
• For loop to sync all episodes has been adjusted to use intersected set as input, thus also initialization of ref_path, foreign_path and output_path was adjusted to match new structure. (output file still keeps the name of reference file)