Backpack Foundations 6.8.0

[gert-janvercauteren]

Update Backpack foundations

This release came with changes to color tokens and updates quite a few components

• Check this if you have read and followed the contributing guidelines

Remember to include the following changes:

• README.md
• Tests
• Screenshotting code
• Adding a component? Remember to expose it in the main Backpack.h header file

If you are curious about how we review, please read through the code review guidelines