[Process] Added support for non-blocking process control Added methods to control long running processes to the Process class:  - A non blocking start method to startup a process and return    immediately  - A blocking waitForTermination method to wait for the processes    termination  - A stop method to stop a process started with start All status-getters like getOutput were changed to return real-time data
[Process] Added support for non-blocking process control Added methods to control long running processes to the Process class:  - A non blocking start method to startup a process and return    immediately  - A blocking waitForTermination method to wait for the processes    termination  - A stop method to stop a process started with start All status-getters like getOutput were changed to return real-time data


hshn/Process,rquadling/Process,symfony/Process,ilijastuden/process