Add Asymmetric Peakcenter

[jirhiker]

Is your feature request related to a problem? Please describe.
when centering on felix we are spending to much to time scanning the low mass side. we want to do a relative wide peak center to capture the masses on the high mass side but dont care about the low mass side as much.

Describe the solution you'd like
Add the ability to specify peak center range with a low offset and a high offset.

Describe alternatives you've considered
add the ability to specify peak center start and end values

Additional context
Add any other context or screenshots about the feature request here.