Runmd

Added
* create get_configuration fonction to simplify the load and validate in cli.py
* add expirimental CLI shell for runmd

Changed
* change print/return with a FileNotFoundError in copy_config()
* remove useless variable in copy_config()
* raise error instead of returining empty list if error reading history file
* change read_history to load_history for coherence with load_config

Added
* add __version__ in __init__.py
* add --version command
* add compile_pattern function (refactoring parser module)

Changed
* add tag flag for the run command instead of +tagname argument
* add tag flag for the list command instead of +tagname argument
* add status for history (success/fail) and collect history only for the run command
* migrate from pkg_resources to importlib.resources (python min version 3.7)
* remove unecessary `blocklist` argument in `process_markdown` function

Added
* add hist command to print runmd history command and replay commands

Changed
* huge refactoring of cli.py

Fixed
* tag option is now working with list command

Added
* add function dedicated to language settings validation

Changed
* remove duplicated code in runner.py
* drop config.json for config.ini

Fixed
* fix the print error when using the run command for a block name which does not exist