💥 New features:
* [Issue 15](https://github.com/Codra-Ingenierie-Informatique/PyPlanning/issues/15) - Charts: show multiple projects status and description:
* New Project Tree that allows users to create, delete, modify and organise projects
* Project selections for charts has not changed
* Project selection for tasks is now done via a combobox
* Projects color can be modified
* Charts:
* Project description is now displayed on the right part of the chart
* [Issue 20](https://github.com/Codra-Ingenierie-Informatique/PyPlanning/issues/20) - Charts: new "Macro tasks" option for grouping tasks related to the same project
* Various enhancements (when creating a task, etc.)
🛠️ Bug fixes:
* Fix some translations
* Fix bugs related to tasks number when moving up or down
* Fix error when creating tasks (from an empty Task Tree, when selecting a resource
or when clicking on a "leave" row)
* Fix chart not updating on project selection
* Fix SVG deletion when opening another planning, *saving as* or creating a new planning
* Fix various issues related to single choice and multiple choices editors