Sign many applications and manifestfiles in batch for click-once

**Is your feature request related to a problem? Please describe.**
Cant sign many application-files in one batch. We have a setup where we have a *.application and *.manifest file per customer and we have about 100 customers. I would like to sign all files in one run.

**Describe the solution you'd like**
When signing CustomerA.application file the program should look for a manifestfile named CustomerA.dll.manifest

**Describe alternatives you've considered**
My workaround now is to temporary move customerA.application and customerA.dll.manifest to a temporary folder and sign them and them move them back.