*update*
> [common]
| add all python file module docstring
| use the new exposed "VxMmap" class in checkers
| add checker for module docstring
| add checker for line length
| fix missing __<special file>__.py
@update
> [common]
¦ rename all log.warning() in log.warn()
> [core/build]
¦ [compile] support explicite extra environment variables setup
¦ [rules] support explicite extra environment variables setup
@fix
> [__main__]
¦ fix error log print
> [core/config]
¦ fix exception riasing if the configuration does not exists
@update
> remove threading support
> core/logger
| use class instead of functions
> __main__
| use the new logger API
| update help message
| use a new "module-loading" methods : (`cli_validate()` and `cli_pase()`)
> cli/build
> core/build
| expose new module interface for the main "module-loader"
| use the new logger API
| change exposed module name ('b' or 'build' -> 'build' only)
| proper isolate the project-meta parsing
| update internal comment and documentation
> cli/pkg
> core/pkg
| expose new module interface for the main "module-loader"
| use the new logger API
| update help message
| rename `vxsdk pkg install` -> `vxsdk pkg clone`
| remove building steps
| remove dependencies resolution
| update backend handling
> core/config
| proper cache support and I/O management
> cli/config
| expose new module interface for the main "module-loader"
> cli/conv
| expose new module interface for the main "module-loader"
@fix
> install.sh
| fix update display
> cli/pkg
| fix version display
| fix CLI argument parsing