Convert the Verilog to Routing test runner from Perl to Python

# Convert the test runner from Perl to Python

VtR has a [`vtr_flow`](https://github.com/verilog-to-routing/vtr-verilog-to-routing/tree/master/vtr_flow) test suite runner. Currently the [scripts are written in a mismash of Perl, Python and bash](https://github.com/verilog-to-routing/vtr-verilog-to-routing/tree/master/vtr_flow/scripts). It would be good if these scripts could all be rewritten in Python.

## Expected results

You can run the vtr test suite without requiring perl to be installed.

# Detailed Explanation

The major scripts which need to be converted are;
- [ ] [run_vtr_task.pl](https://github.com/verilog-to-routing/vtr-verilog-to-routing/blob/master/vtr_flow/scripts/run_vtr_task.pl)
- [ ] [run_vtr_flow.pl](https://github.com/verilog-to-routing/vtr-verilog-to-routing/blob/master/vtr_flow/scripts/run_vtr_flow.pl)

Some minor scripts which could be pretty easily converted are;
- [ ] [blif2vhd.pl](https://github.com/verilog-to-routing/vtr-verilog-to-routing/blob/master/vtr_flow/scripts/blif2vhd.pl)
- [ ] [vcd2act.pl](https://github.com/verilog-to-routing/vtr-verilog-to-routing/blob/master/vtr_flow/scripts/vcd2act.pl)
- [More stuff can be found via this search](https://github.com/verilog-to-routing/vtr-verilog-to-routing/search?q=language%3APerl&unscoped_q=language%3APerl)

# Knowledge Prerequisites

* Some Perl
* Some Python

Start by reading vtr_flow/scripts/run_vtr_task.pl and run_vtr_flow.pl, then inspect the smaller Perl scripts such as blif2vhd.pl and vcd2act.pl. Run the vtr_flow test suite before and after the conversion. Done means the suite runs without Perl installed and the listed runner scripts are implemented in Python.

Written by the indexing model from the issue text.