Sigma-cli

* Create MITRE ATT&CK heatmaps
* Updated to pySigma 0.9.9

Fixed issue with installation of plugins in pipx virtual environments (and possibly others)

* Updated pySigma (new modifiers for regular expression flags and field comparison, fixes)
* Update from standard input if single `-` file name is provided
* `sigma check` input files are now required. Previously it quit silently suggesting rules were checked.
* List supported modifiers, processing transformations and conditions with new `sigma list` commands.

* Improved error handling and messages with helpful command lines.
* Added CIDR support for IPv6 and fixed IPv4 CIDR support.

Bug fixes:

* Added name to key-value parameter type.
* Removed colliding `-P` shortcut from `--without-pipeline`.

* BREAKING CHANGE: Removal of backend-specific options `--min-time` and `--max-time`.
* Addition of `--backend-option`/`-O` option for passing options to the backend as key=value pairs.

If `--min-time` or `--max-time` were used before this has to be migrated to `--backend-option min_time=...`.