Implement attach for Windows

[raefko]

Hello!

I started working on this pull request to continue the -attach option.
For the moment it can attach to a process.

drrun.exe -attach <PID>

I will continue to improve it and I will create the testsuite after.

[raefko]

I also need some help:
I am trying to attach dynamoRIO to lsass.exe, but it looks like this line can't wait for lsass.

success = dr_inject_wait_for_child(inject_data, limit_millis);

If someone wants to try, you have to run drrun.exe with psexec -s -i.

[derekbruening]

Thank you for the contribution. It looks like this is similar to the PR #3328, which was the source for PR #5075 which was merged as a0a44a9. I think we can close this as its functionality is now in the repository.