Recreate final assignment and make it more versatile

[christophfink]

Currently, the final assignment offers a lot of detailed guidelines for two of the three suggested topics. However,

1. the third topic is completely hanging in the air
2. the two more defined topics are really close to each other, it might be good to include example cases from other areas in the students’ studies
3. the general instructions are not very detailed (e.g., some students in 2022 initially thought they had to complete all three options)
4. the assignments should be less constrained, i.e., appeal more to the creative application of the newly-learnt skills rather than provide a step-by-step cooking recipe

ad 2) there could be more topic suggestions, for instance, touching upon remote sensing or physical geography example cases