Jupyterlab-code-formatter

**Server extension**

- Support more styler options;
- Fix bad string comparsion of version strings;
- Compile regex once only;


**Jupyterlab extension**

- Support more styler options;
- Fix bad capitalisation of config schema;

**Server extension**

- Retain semicolon after black's formatting action - courtesy of dfm;


**Jupyterlab extension**

No Change.

**Server extension**

- Support formatting multiple code cell at the same time - courtesy of mlucool;
- Return formatting error if they exists - courtesy of mlucool;


**Jupyterlab extension**

- Add `jupyterlab_code_foramtter:format` command and context menu button - courtesy of mlucool;
- Add `jupyterlab_code_foramtter:format_all` command and command tools bar button - courtesy of mlucool;

**Server extension**

- Trim trialing newline for autopep8;


**Jupyterlab extension**

No changes.

**Server extension**

- Fix bug where presence of `rpy2` could cause plugin to be useless;


**Jupyterlab extension**

No changes.

**Server extension**

- Support `styler` - Another R code formatter - courtesy of dev-wei;

**Jupyterlab extension**

- Support `styler` - Another R code formatter - courtesy of dev-wei;