Is the feature request related to a problem

I have a custom installation folder for both VS Code and Visual studio. The search paths for these diff tools don't match with the ones hard-coded inside DiffEngine.

Describe the solution

One should be able to set a custom path for diff tools, for example with the help of environment variables.
For example: DiffEngine_<DiffToolName>_Path = D:\My\Folder\

Describe alternatives considered

As alternative, consider reading a configuration file in the home directory of the user or in the project folder.

Additional context

If necessary ask me.