Add file name variation check plugin

[12xx12]

This pull Request creates a new Plugin for flows that checks if there is a similar file in a folder.

It replaces certain properties in the file name with a provided string.

For now the

• resolution
• video codec
• video container

Can be replaced.

Use case:
You have h264 files with a "h264" in the file name. After converting them to h265 you change the new file to contain "h265"/"hevc" at the same position.

Now you change your file naming scheme and tdarr detects the old h264 file as new and tries to convert. But this shouldnt happen. With this plugin you can set the variation check codec to "h265" and add this to your flow. Now you can check if there is a similar file with the codec in the file name.