Rummage

- **FIX**: Fix incompatibilities with latest Regex versions.

- **FIX**: Require Backrefs 4.0.1 which includes a number of bug fixes, particularly one that sometimes caused Backrefs not to install properly.

- **FIX**: Python file encoding detection should default to the Python 3 assumed default, not Python 2.
- **FIX**: Consolidate internal HTML logic and avoid using base 64 encoded images if using latest Markdown extensions that include path conversion fix.
- **FIX**: Refresh status less to improve on overall speed.
- **FIX**: Simplify status: no need to display `ACITVE` or `DONE` as button will change back to `Search` to signify completion along with the display of the `Benchmark` or even the notification if enabled.
- **FIX**: Ensure single file search with no pattern works like multi-file search with no pattern (just return file).
- **FIX**: Minor cleanup and performance increase in core.
- **FIX**: When search error dialog is shown from the status bar, fix error with window destruction.

- **NEW**: Documents are now included locally in installation and can be viewed directly in Rummage via a webview dialog.
- **NEW**: License can now be viewed from the application menu.
- **NEW**: Show changelog on next launch after upgrade.
- **NEW**: Render editor instructions as HTML in the settings dialog.
- **NEW**: Simplify regular expression engine selection settings panel.
- **FIX**: New about dialog that no longer breaks on Linux.

- **FIX**: Adjustments to work with `wcmatch` version 2.0.0.

- **FIX**: Process preview in regular expression test dialog when replace pattern is empty. If replace plugin is enabled, we must have a plugin specified.