added gpio393 module (ported from twelve_ios) to read/write GPIO pins, selectively release control to other modules

Modified camsync393 to support individual delays/timestamps for 4 sesnor channels, changed I/O to mclk domain

Bug fixes, added parametrized generation of the address/strobe before data by specified number of clock cycles

Working on cmprs_afi_mux.v, extracted 2 sub-modules: cmprs_afi_mux_ptr.v and cmprs_afi_mux_ptr_wresp.v

Added modules to convert 32-bit parallel writes to two registers to 8-bit wide network for writing consecutive locations in block memories

Added modules to convert 32-bit parallel writes to two registers to 8-bit wide network for writing consecutive locations in block memories