Let's check code style everywhere
Correct some rubocop offenses
Reword comment
Simplify method
No verbose output for rc scripts
More resilient tests for stepping

Now line numbers are specified inline in the code to be evaluated. This
makes the tests more resilient, because a single addition or removal in
the file they belong to will not break them as it used to happen before.
All test should be eventually migrated to this new style.
Automatically compile extension when running rake
Sample configuration for windows CI
This tasks didn't belong here
Enable DevKit when compiling in Windows
THREAD_{BEGIN,END} events include null fields
Fix indentation
Simplify print_backtrace method
Remove unnecessary require
Simplify debug_proc test method
Clean up test_helper a bit
Extract an utility method
Tweak debug_code method to load a real file.

The new version is as resilient as the previous one, but has the
advantage that we can make assertions on both the file name and line
numbers now.
Standarize a couple of comments
Migrate frame tests to use debug_code method