Rummage

- **NEW**: Officially support Python 3.10.

- **FIX**: Pick up latest `wcmatch` (8.3), `bracex` (2.2), and `backrefs` (5.2) to acquire latest related bug fixes
related to file search patterns and regular expressions (if using `backrefs`).
- **FIX**: Update internal Markdown and extensions (`markdown` 3.3.4 and `pymdown-extensions` 9.0 and M) to ensure
latest changes and fixes for UI elements that render Markdown to HTML.
- **FIX**: Update to latest `chardet` (4.0).
- **FIX**: When chaining literal and regular expression patterns together, the mode could get stuck in literal mode
when applying replacements.

- **FIX**: Use latest `wcmatch` (8.1) which does a better job at bailing out of really large expansions. Patterns like `{1..1000000}`, while they used to bail according to the set limit, would hang a bit before they do. The whole point of bailing was to avoid hangs (if possible) if the intent was disallow such a large pattern now they assert much quicker.
- **FIX**: Fix internal documentation "Home" link. On certain pages, the link could be broken.

- **FIX**: Support info won't open.
- **FIX**: Small internal code improvements.

- **FIX**: Linux regression of date time control color due to recent color fix for macOS in 4.15.1.