Parallel readout scheme. Added the corresponding components. Individual vmm_read…

…out modules, a reworked packet_formation module, a vmm_driver module, a RAM2UDP module which instantiates a parallel-written generic BRAM block, and multiplexers that control the flow of data to the UDP block. The UDP block receives data either from the xadc, the config_logic, or RAM2UDP. Config_logic now produces a simple configuration reply packet. The firmware has been verified from October but the Gitlab version remains still untested.