Hide underground platforms mapped as lines

[lakedistrictOSM]

As mentioned in #3162 (comment)

Hide railway=platform with location=underground

Example problem area - Newcastle

[kocio-pl]

Would you (or anybody else) like to try to create code solving this? Should be similar to #3162.

[famo]

Would this change also include hiding underground highways (footways, stairs, etc)?

[kocio-pl]

I believe no, that's why I didn't touch them before. They are less visible anyway, they are not rendered as solid and hiding some of them would break continuity.