areset -> async

Closes L2SDP-541

See merge request desp/hdl!181

Resolve L2SDP-551

Closes L2SDP-551

See merge request desp/hdl!179

connected ref_sync

Closes L2SDP-556

See merge request desp/hdl!180

added missing scynchronization

Closes L2SDP-541

See merge request desp/hdl!178

Resolve L2SDP-532

Closes L2SDP-532

See merge request desp/hdl!177

Added .gitlab-ci.yml

Closes L2SDP-534

See merge request desp/hdl!174

-Added header, author, purpose, description and link to Confluence.
-Improved comment and comment blocks.

Updated lofar2_unb2b_ring design for synthesis, also created

Closes L2SDP-279

See merge request desp/hdl!176

Fix Quartus error : Can only use constant for LOOP range in func_sdp_map_crosslets_info() and func_sdp_step_crosslets_info().

Updated because text is now in https://support.astron.nl/confluence/display/SBe/VHDL+design+patterns+for+RTL+coding.

Use sdp_info_ro := c_sdp_info_rst default, to avoid Quartus Warning (16788): Net sdp_info_ro.station_id[15] does not have a driver at sdp_info.vhd(67)

Corrected func_sdp_gn_index_to_pn_index to use v_index as variable, because g_index can be a signal.

Added t_sdp_sim. Add func_sdp_get_stat_*() functions to determine the header...

Closes L2SDP-545

See merge request desp/hdl!175