Replace Makefiles with Bash scripts

[ezelioli]

This PR addresses issue #72.

[thommythomaso]

Started rebasing this branch on other efforts: ez/unmake-rebase

[thommythomaso]

Depends on #102

[thommythomaso]

Depends on #111

[phsauter]

Some notes:
run_all.sh:

• without argument does nothing
• flist: add --relative-path
• flist: remove -D VERILATOR=1
• flist: move to synthesis script or output to synthesis dir
• add simulation

delete ethz.env:

run_synthesis.sh:

• Could have a interactive argument that starts a Yosys interactive TCL shell
• There is a second croc.flist here but the one from root is used?
  Use the one from here and change the root to output to here
• Convert to proper 'form'
• Map tmp to scratch or have a central top-level tmp like cockpit

yosys_synthesis.tcl:

• Move some things or alias to common? (eg define a write_netlist or something like that)
• Reduce dumping to tmp and reports
• Check for new options added with yosys-slang like cross-hierarchy optimization
• Maybe warn at the end of some things aren't mapped to cells?

run_verilator.sh:

• Get binary from args
• otherwise this is a good example how it should work

run_vsim.sh:

• Give binary via args
• per default with gui, add arg to set it to shell-only

run_vsim_netlist.sh:

• Give binary via args
• per default with gui, add arg to set it to shell-only

sw:

• Add a seperate test subdir for timer test and more atomic tests of certain features

run_backend.sh:

• Still needs simplifying
• Maybe one function that calls OR with all args and the script to execute is given to it, no checking for checkpoints etc?

finishing.sh:

• Rename to run_finishing?

[phsauter]

• delete ethz.env
• env.sh, Copyright to current year
  • Add author
  • change PDK_ROOT comment (it no longer has priority)
  • section headers look a bit awkward
  • I think only the tool directories and the netlist and openroads final def should be set here
    Remove YOSYS_OUT, YOSYS_REPORTS, YOSYS_TMP, OR_OUT, OR_REPORTS, OR_SAVE (move to tools, if possible to the tcl scripts)
• Update README.mds 'Getting started' and 'Building on Croc'
• run_vsim.sh
  • Add author
  • "Compile Croc RTL in VSIM" -> delete additional whitespace
  • "Compile Crop post-synthesis netlist in VSIM" -> typo
  • Explain example
  • Remove +acc for non-gui function?
  • Add Siemens permission text (see compile_tech.tcl)
• run_vsim.sh
  • Add author
• run_openroad.sh
  • Add author
  • "Run a script relativ to the script direction" -> typo
• startup.tcl
  • get netlist from env var NETLIST
• OpenROAD stages
  • Check descriptions in header, required env variables seem outdated
  • "Old versions of repair_timing may swap non-equal pins, deactivated for now to avoid problems" -> Remove and re-add pin-swapping; in README make it clear only oseda-2025.12 is supported.
• Add latest feature to checkpoint (if it already exists)
• All, some on-line comment to describe what the functions do would be nice