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[MajaLinder]

Fixes #19 #20 #21 #22 #38

Changes proposed in this pull request:

• Adds feature for coloring buttons when they are activated
• Adds feature showing current mode settings to the user
• Adds speedometer to the screen
• Updates forward arrow functionality
• Refactors code

Close @karlstahre @MajaLinder

[MajaLinder]

Before merging to master, fix all checks