Improve utilities command line interfaces

[moralismercatus]

Utilities such as crete-dispatch, crete-vm-node, and crete-svm-node could all use some improvement in their command line interfaces.

All:

1. Don't report exception is thrown when, for example, --help is used, or an incorrect option. Simply fixed by throwing a special purpose exception that is caught in a special purpose catch block e.g., something like crete::CmdLineArgException or crete::EarlyExitException

crete-dispatch:

1. Include the ability to give a timeout as a cmdline argument e.g., --time-out/-t. A commonly requested feature.

crete-vm-node:

1. -n erroneously states "number of svm instances". It should be "... vm instances"
2. Provide complementary --vm option to crete-svm-node's --svm option that allows the user to specify the path of VM to use. I believe the reason this option was omitted originally is because the VM is architecture dependent; however, if that behavior is still desired at the cmdline, I don't see why it can't be done as --vm-x86, --vm-x64 options. Note that crete-svm-node uses platform agnostic --translator.
3. Change option --port-master to simply --port. Originally done to distinguish from --guest-port before ports for guest were automatically selected.