globalvars.py: Use ConfigParser instead of RawConfigParser
globalvars.py: Use ConfigParser instead of RawConfigParser

According to the documentation for `configparser.RawConfigParser` (https://docs.python.org/3/library/configparser.html#configparser.RawConfigParser), this is a **legacy** API call that allows for non-string section names, option names, and values via the unsafe `add_section` and `set` methods.  We don't use those methods, but it's overall still a legacy compatibility and should be avoided.

The documentation suggests that instead of using `RawConfigParser`, we should use `ConfigParser` and set `interpolation=None` at instantiation instead.

Charcoal-SE/SmokeDetector,Charcoal-SE/SmokeDetector