Add an option to auto-color projects when importing

[ChristianHuehn]

Feature request

Description

As a user, I want to be asked to auto-color different maps when importing multiple maps, so that I have a better initial overview

Acceptance criteria

• When importing ask the user if they want to auto-color all maps without a color
• Auto-Coloring should have different colors that have a high contrast to each other
• Text should still be readable

Assumptions & Exclusions

An example to find contrasting colors: https://stackoverflow.com/questions/407793/programmatically-choose-high-contrast-colors

Development notes (optional Task Breakdown)

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