GeoJson import/export

[rlandolt]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Points'
2. Filter by a small date range (to have a smaller export)
3. Click on 'Export as GeoJSON'
4. Download the file and check the Coordinates

Expected behavior
According to GeoJSON.org and the RFC 7946 the coordinates should be an array with numbers.

Actual behavior
Instead, the array contains the coordinates as strings.
For the geodata part then again, the coordinates are represented as an array of numbers (so there it is correct)