* flash-wrs: add gateware selection to only use 2 HDL binaries because the RAM size is not big enough to extract 4 HDLs during flashing
* build: add the new gatewares with PWM and LX240T support for 18ports & 8ports
* userspace: Select the proper gateware to load on fpga using the shw_ver tool and the i2c dip switch on miniBP