Picopt

- Reduce overzealous png optimization. Provide an option to do that.

- Alert!
- Timestamps options changed, invalidating old timestamps. On your first run
in a path with picopt 4.0 use the `-N` option to ignoring the old timestamp.
- Features
- Support optimizing SVG with svgo.
- Support converting more lossless formats to PNG & WEBP: CUR, DIB, FITS, IMT,
PCX, PIXAR, PSD, QOI, SGI, SPIDER, SUN, TGA, XBM, XPM.
- Support converting animated formats to animated PNG.
- Support converting losslessly converting MPO to JPEG (choose primary image)
- Internal oxipng replaces external optipng for png compression.
- Better support for preserving EXIF, ICC_PROFILE, & XMP data across
optimization and conversion.
- `--destroy-metadata` option becomes `--strip-metadata`
- `--near-lossless` option for lossless WebP.
- `--preserve` file attributes after optimization.
- `--disable-programs` option.
- ~25% faster due to avoiding disk io.
- Fixes
- wal file would write illegal key names and fail to load for some files.
- Dev
- walk.run now returns totals instead of running report on them.

- Fix
- Remove Lossy WebP optimization. Wasn't optimal.
- Fix non zero exit code on success.
- Features
- Improve WebP optimization.

- If unrar is not available do not convert rar. Was making empty zips.
- Support zip deflate64

- Wasn't skipping directories appropriately.

- Keep original path suffix if not converting.