vivado.tcl is now the entrypoint for the Vivado Tcl scripts and will
automatically source all the other required scripts.

A command line argument parser was written and replaces the previous system of
using environment variables to pass values into the scripts. The VSRCSVIVADOTCL
environment variable has been replaced with a -F command line option, and the
file format has changed from a Tcl script to a simple newline-delimited list of
files.

signal_bundles: Use the new way as .fromPorts is gone

Use a file instead of environment variable to pass VSRCS into Vivado

Support both 4G and 1GB DIMM configuration for VC707

Generate IP TCL and MIG projects from the Chisel blackboxes

synchronizers: Use new primitives

fix PCIe vc707 design contraints : PCIe pins and UART RX sync register