[patch] DLL injection

[anirudhb]

This isn't really an issue, but I thought I'd leave my patch here, since it may be helpful to some other people. It changes atloader.exe to enumerate the running processes and find the given executable, then injects the library using CreateRemoteThread. (I've only tested in osu, and it hasn't triggered any kind of anti cheat. I can't say the same for other apps.) The DLL has also been updated to patch windows after-the-fact and hook raw input devices.

Here's the patch for anyone that's interested:
absolutetouchex-injection.patch

I didn't make a pull request since it didn't seem appropriate to add this functionality to the main project, and it's more of a special-case use I suppose.