Simplify configuration after install

[Fxhnd]

Installation has become easier because of the wheel, but Macleod still doesn't, "Just Work" immediately after install. This could be simplified by setting some safe cross-platform defaults in the configuration and then adopting a setup where a user-supplied config file overrides the default behaviour if needed.

1. Change how Macleod searches for and uses the provers
   • Search for the application name on the PATH environment variable
   • If the name is found then assume it is active by default
   • Default some values, using minimal system resources, for each application
2. Change how Macleod resolves imports relative to other files
   1. Standard search paths
      * Documented standard search order people can reference (e.g. cmake) and build their workflow around
      * Begin search for imports relative to current file or current working directory
      * Continually search folders higher in filesystem until some stopping point (e.g. marker file, max_limit, etc)
      * Configuration values accept HINTS of directories to search first prior to the tiered search upwards
      * Add COLORE (https://github.com/gruninger/colore), OntoHub (https://ontohub.org/) well known URIs
      * Configuration accepts additional URIs for import parsing
3. Allow users to manually override each setting via their own config file given by some file following some standard location (maybe ~/.macleod, %APPDATA%, XDG standard, etc)
4. Both CLI entrypoints and the GUI should accept a config file as an optional argument and/or support overriding individual parameters via the command line.