Edalize

======================================================
* Fix lint-only mode in Verilator

======================================================
* New flows: efinity
* New tools: efinity, sandpipersaas
* cocotb support for simulation flow
* New backends for legacy Tool API design_compiler, genus
* libero: Support projects without constraints or source files
* ise: Add --pgm switch
* radiant: Support SystemVerilog
* quartus: Add --pgm switch
* SymbiFlow: Support SystemVerilog
* verilator: Support additional gen-xml, gen-dpi-hdr, gen-preprocess modes
* vivado: Add --pgm switch
* vunit: Support file dependencies
* Fix EDAM documentation for flows and tools

======================================================
* yosys: Fix yosys_template option
* verilator: Fix dependencies on testbench files
* icarus: Add missing vvp_options
* Remove filelist backend
* vivado: Add programming option

======================================================
* New flows: generic, gate-level simulation
* New backends: filelist, sandpipersaas, openroad
* modelsim: Support mfcu mode
* icarus: Support multiple toplevels
* yosys : Support verilog output and simulation tag
* vivado: Support netlist generation an simulation tag
* Overhauled documentation
* Improve internal flow API
* Support external plugins
* Avoid unnecessary rebuilds with flow API

======================================================
* New flows: f4pga
* New backends: slang, Questa Formal
* Migrated to flow API: icarus
* icarus: Add vvp_options, support multiple top levels
* ise: Support FPGA families with spaces in name
* openlane: Support SystemVerilog
* vcs: Support launchers
* verilator: Fix include files
* vivado: Support launchers, fix pnr=none, fix include dirs on windows
* yosys: Only use -pvector for edif
* el_docker: Support additional docker args, update openlane version
* Don't capture output of script hooks

======================================================
* New backends: OpenFPGA, VPR, Mistral, gatemate
* symbiflow: Support Quicklogic
* xsim: :Fix VHDL generics quotation
* ISE: Added option to Specify JTAG chain index, fix windows path handling
* verilator: Support EDALIZE_LAUNCHER, limit CPU usage
* icestorm: Add icepack_options
* el_docker: Run as user instead of root
* vcs: Support boolean plusargs without value
* yosys: Support verilog output
* Flow API: Add get_tool_options function