main: Use boost program options parser instead of Glibmm

Change-Id: I14a8a97c6e89c1fa73227ea8db408a4ebfd3fa12
main: Parse commanline options also from environment variables

Change-Id: I640eff6f1d1a648be7e6794cb41ab82a7b23e86a
main: Print mediaserver version when -v option is passed

Change-Id: I1f94a6532bb2e6409b85c86ea03d1a10bb2cdfed