sysutils/bhyvemgr: New port: Bhyve management GUI written in Freepascal/Lazarus

Bhyvemgr is a bhyve management GUI written in Freepascal/Lazarus ofor FreeBSD.
It needs a bunch of tools mostly installed on base system and some installed
from ports/packages. Currently it supports only amd64. The main goal is to be a
desktop user application to easily and quickly setup and run virtual machines
on the FreeBSD host.