Jupyterlab-code-formatter

**Server extension**

No changes.

**Jupyterlab extension**

- Minor fix for error messages;

**General**

- Project reorganisation, improve plugin packaging, massive thanks to ianhi for laying the groundwork;

**Server extension**

No changes.

**Jupyterlab extension**

- Fix icon color in dark theme, courtesy of AllanChain;

**Server extension**

- Handle shell commands in code cells;

**Jupyterlab extension**

No changes.

**Server extension**

No changes.

**Jupyterlab extension**

- Fix isort schema spec for the following settings:
- known_future_library
- known_standard_library
- known_third_party
- known_first_party

**Server extension**

No changes.

**Jupyterlab extension**

- Fix server URL lookup for JupyterLab 2.2.0+;

**Server extension**

- Fix semicolon handling again;

**Jupyterlab extension**

No changes.