Enable Static Tools Customization

[Werebunny]

Expected Behavior

Default Tools can be customized.

Current Behavior

User must create their own custom tools.

Possible Solution

Implement a ReaderWriterLockSlim around them, and allow hints to be added to the Tools at large through delegates.

Additional Information

This will make the library easier to use and customize, instead of having users create their own Tools file with their customized Tools.

[Werebunny]

Because xUnit doesn't have proper assembly init point, another mechanism will be needed. I'm thinking an attribute that can reference rules that the tools look for.