In this TC, additional change was needed in
reference Manifest, and TC runner function
accordingly, in addition to prom stage
clean target, as for other tools in previous
commit.

All testcases are passing on Linux.

Lattice Diamond tool related changes resulted
in clean targets for 'prom' stage added in some
other, non-Lattice Diamond Makefiles as well.
Related Testcases adjusted.

TODO: This behaviour might need to be checked
and improved later.

Adjusted testcases are passing in Linux.

Lattice Diamond tool related changes need to be
adjusted in related testcase as well.

Lattice project file removal - purge - TCL command
was directly used in the Makefile target generation,
instead of using the already defined tcl command
string.

- Lattice MachXO2/3 FPGA devices have internal boot Flash
  that can be targeted via Jedec PROM file.

- To support FLASH/PROM file generation
  as a separate stage from bitfile generation

- Preventing project source file duplication
- prj_src remove -all seems to not remove .lpf fi
  le, therefore causes error when adding again.
- When creating the project file, Diamond automatically adds
  the .ldf file to project, it the file exists with the same
  name as the created project.
  Therefore causing error as duplicated file addition.
- lpf is not added, only a commented-out
  tcl command is generated to the files.tcl

- This is just a quick hack, to be improved later

For later use in Makefile generation

- When run from command line (win/powershell, win/cmd, linux/bash),
  adding files already in the project causes failure.
  The reason is that diamond tcl interpreter returns some
  unexpected value.
  Therefore the make command fails at sourceing files.tcl

- Manually starting diamond tcl console and sourcing the files.tcl
  directly there seems fine.

- As a workaround, adding pre-fileadd tcl command to remove all
  sources from the project

- Seem to cause issues with lattice batch mode if project file
  already exists

- diamond project file is genereted when running make anyway

Improve testsuite on windows

[fix][testsuite][vivado] Adjust Testsuite to !14

See merge request !15

Adjust testsuite to match mergerequest!14.

Testsuite passes on native Linux.

Add missing dir to Vivado clean targets

See merge request !14

makefile: make synthesis depend on source files

See merge request !13

When set to False, timing failures are ignored during implementation

This causes synthesis failures with verilog files that import
from each other.

For #117