Quote LAUNCHER_PROPERTIES argument to the launcher

This allow the project launcher to work with whitespace in path.

v1: by Carter:
    - adjust the ProjectLancher to always add quotes
v2: by Ferry:
    - also adjust the Launcher itself to strip off the quotes
      (when present)
    - also adjust the ProjectLauncherImplTest to strip off the quotes
      (when present)

Original-by: Carter Smithhart <carter.l.smithhart@boeing.com>
Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>