Current delta between SymbiFlow/yosys and YosysHQ/Yosys in master+wip

[mithro]

• [ ] #41 - https://github.com/SymbiFlow/yosys/tree/attributes-on-parameters - Enable attributes on parameters.
• [ ] #40 -https://github.com/SymbiFlow/yosys/tree/carry-rework - Use CARRY4 rather than multiple CARRY objects.
• [ ] #39 - https://github.com/SymbiFlow/yosys/tree/disable-ramb36e1 - Disable RAMB36E1 output
• [ ] #38 - https://github.com/SymbiFlow/yosys/tree/disable-srl16 - Disable SRL16 output

[mithro]

FYI - @eddiehung