Revert "Fix typo and year for Initial Developer Globally in License Notice"

This reverts commit 94e7de483ab8e6a9230f0f3340e8653f19feaee7.
Revert "Globally replace GPL License Notice"

This reverts commit 0d2cc75e593d9f576548c511f36a547523962da9.
Use only MPL 2.0 instead of GPL 3

This project was originally licensed as MPL and as such we enjoy the privilege under the MPL to exclusively use that license.