Remove dependency on Serilog

[undiwahn]

I'm not sure we even actually log to serilog; it's a dependency we don't really need to take on.

Possible Solution

If we are actually logging somewhere, we'd want to migrate to something like LibLog that provides an abstract way for the implementor to designate the logging library.

Expected Behavior

Should not have to install & use serilog to use popcorn.

Actual Behavior

Serilog is brought in as an automatic dependency.