GitLab

* Fixed star and starburst objects so that they render properly withing the selection bounding box. Lots of math. Still to do is to handle situations when the bounding box is very small and the stroke width of the star[burst] makes the interior corners overlap.  Currently causes weird rendering.

* Fixed some minor typos and formatting errors in the comments.  No changes to executable code.

* The MongoDB/Mongoose data storage is removed in favor of Sequelize. This abstracts over SQLite or RDBMs like PostgreSQL and MSSQL. The default is SQLite, which significantly simplifies deployments in end-user environments.

* As Spacedeck now has no more mandatory server dependencies, we can wrap it in Electron and ship it as a desktop application.

* Removes docker-compose.yml

* First version of import UI