fix implicit conversion from float to double warnings

[MatejFranceskin]

Converted constants from double to float to avoid compiler "warning: implicit conversion from 'float' to 'double'".

[jgromes]

Thank you for the contribution - it will take me some time to go through it to double-check all of those are really supposed to be floats. I will also have to fix the conflict that just got introduced by merging #1388 ...

BTW, which warning did you enable to get this? I thought we should have nearly all enabled in the CI, but this was not in there ... thanks!

[MatejFranceskin]

The option seems to be -Wdouble-promotion
warning: implicit conversion from 'float' to 'double' to match other operand of binary expression [-Wdouble-promotion]
The way I see it is that you never use doubles so it is just better to have float constants.

I resolved the conflicts.

[jgromes]

Thank you so much - I went through the changes and it all looks good, so merged. The CI fails are unrelated and can be ignored. I will also add the appropriate flag to the CMake.