really fast and thorough golang port of tfrdidi/sort-PhotorecRecoveredFiles which is a fork of ChrisMagnuson/sort-PhotorecRecoveredFiles

• concurrency - process files concurrently using configurable worker pools via panjf2000/ants.
• wav file support - restore filenames for WAV by reading the RIFF header.
• symbolic linking instead of copying - create symbolic links instead of copying files.
• more spooky bugs to discover - there's a saying that applies here; "go fast, break things". this seems to work fine, and should be safe, but.. y'know. use with caution until test cases are introduced.
• configurable restoration of copy functionality - right now it's symbolic links only

flags are ported directly (with a few additions) from the original script, so they should be familiar to anyone who's used that.

Usage of ./sortrec:
-date_time_filename
Sets the filename to the exif date and time if possible
-dest string
Destination directory to write sorted files to
-keep_filename
Keeps the original filenames when copying
-max-per-dir int
Maximum number of files per directory (default 500)
-min-event-delta int
Minimum delta in days between two events (default 4)
-pools int
Number of pools to use (default 25)
-split-months
Split JPEG files not only by year but by month as well
-src string
Source directory with files recovered by Photorec
-workers int
Number of workers to use (default 5)