cura1-lulzbot-21.06-bp153.1.16

- fix file conflicts

- rename to cura1-lulzbot to trigger update to parallel version 3

- fix license tag

- fix startup crash due to missing libglut3

- Fix grammatica errors.

- update to version 21.06
  * use original upstream tar ball
  * clone curaengine via source service since it is not included anymore

- avoid conflicts with cura 2
- link CuraEngine dynamic
- open documentation using xdg-open instead of hardcoded Firefox

- initial package based on upstream package for Fedora