Merge isVehicleOnGround and isPedOnGround into one function "isElementOnGround"

[CrosRoad95]

Is your feature request related to a problem? Please describe.

not really, just for api quality reason

Describe the solution you'd like

merge isVehicleOnGround and isPedOnGround into one function "isElementOnGround"

Describe alternatives you've considered

/

Additional context

if you have function suitable for more than one type of element, it should have name beginnin with "isElement ""setElement" ect

Security Policy

• [X] I have read and understood the Security Policy and this issue is not about a cheat or security vulnerability.