* deprecated the ProcessBuilder class
* deprecated calling `Process::start()` without setting a valid working directory beforehand (via `setWorkingDirectory()` or constructor)
* added command line arrays in the `Process` class
* added `$env` argument to `Process::start()`, `run()`, `mustRun()` and `restart()` methods
* deprecated the `ProcessUtils::escapeArgument()` method
* deprecated not inheriting environment variables
* deprecated configuring `proc_open()` options
* deprecated configuring enhanced Windows compatibility
* deprecated configuring enhanced sigchild compatibility
* added support for PTY mode
* added the convenience method "mustRun"
* deprecation: Process::setStdin() is deprecated in favor of Process::setInput()
* deprecation: Process::getStdin() is deprecated in favor of Process::getInput()
* deprecation: Process::setInput() and ProcessBuilder::setInput() do not accept non-scalar types
* added the ability to define an idle timeout
* added ProcessUtils::escapeArgument() to fix the bug in escapeshellarg() function on Windows
* added Process::signal()
* added Process::getPid()
* added support for a TTY mode
* added ProcessBuilder::setArguments() to reset the arguments on a builder
* added a way to retrieve the standard and error output incrementally
* added Process:restart()
* added support for non-blocking processes (start(), wait(), isRunning(), stop())
* enhanced Windows compatibility
* added Process::getExitCodeText() that returns a string representation for
the exit code returned by the process