manage Win32 processes using Jobs

[xilun]

for a more proper suspend and termination support

See Job Objects and Job Object Functions on MSDN.

Note: process should be created suspended, then put in the job, then resumed, otherwise there is a risk of a race where newly created processes could spawn others before being put in the job...

[xilun]

done for termination, in progress (already works well in most cases) for suspend/resume

[xilun]

ok with d55f15f