Add on the fly Sigma YAML rule conversion with pySigma

Add conditional imports to limit error for functions not used
Add option groups to improve help readability
Correct typo in docs
Update some error messages
Bump version to 2.20.0

Makefile

@@ -3,7 +3,7 @@
 DOCKER?=docker
 DOCKER_BUILD_FLAGS?=
 DOCKER_REGISTRY?=docker.io
-DOCKER_TAG?=2.10
+DOCKER_TAG?=2.20.0
 GIT?=git
 PY3?=python3
 DATE=$(shell date +%s)

docs/Usage.md

@@ -27,7 +27,7 @@ git clone https://github.com/sbousseaden/EVTX-ATTACK-SAMPLES.git
 
 ### Installation from repository
 
-#### Using [*venv*](https://packaging.python.org/en/latest/guides/installing-using-pip-and-virtual-environments/) on Linux/MacOS
+#### Using [venv](https://packaging.python.org/en/latest/guides/installing-using-pip-and-virtual-environments/) on Linux/MacOS
 
 **Requirements** : Python 3 venv
 
@@ -45,7 +45,7 @@ python3 zircolite.py -e EVTX-ATTACK-SAMPLES/ -r rules/rules_windows_sysmon_pysig
 deactivate # Quit Python3 venv
 ```
 
-#### Using [*Pdm*](https://pdm-project.org/latest/) or [Poetry](https://python-poetry.org)
+#### Using [Pdm](https://pdm-project.org/latest/) or [Poetry](https://python-poetry.org)
 
 ```shell
 # INSTALL
@@ -364,14 +364,14 @@ Default rulesets are already provided in the `rules` directory. These rulesets o
 
 ### Generate rulesets using PySigma
 
-#### Using [*Pdm*](https://pdm-project.org/latest/) or [Poetry](https://python-poetry.org)
+#### Using [Pdm](https://pdm-project.org/latest/) or [Poetry](https://python-poetry.org)
 
 ```shell
 # INSTALL
 git clone https://github.com/SigmaHQ/sigma.git
 cd sigma
 pdm init -n
-pdm add pysigma sigma-cli pysigma-pipeline-sysmon pysigma-pipeline-windows pysigma-backend-sqlite
+pdm add pysigma pip sigma-cli pysigma-pipeline-sysmon pysigma-pipeline-windows pysigma-backend-sqlite
 
 # GENERATE RULESET (SYSMON)
 pdm run sigma convert -t sqlite -f zircolite -p sysmon -p windows-logsources sigma/rules/windows/ -s -o rules.json