hdl

Added src/vhdl/common_paged_ram_cr_cw.vhd to synth_files. Added tb/vhdl/tb_common_paged_ram_cr_cw.vhd and tb/vhdl/tb_common_paged_ram_rw_rw.vhd to test_bench_files. Added tb/vhdl/tb_common_paged_ram_cr_cw.vhd, tb/vhdl/tb_common_paged_ram_rw_rw.vhd and tb_common_paged_ram_ww_rr.vhd to regression_test_vhdl.