release v4.1.0

Author: 1138-4EB

docs/release_notes/4.1.0.rst

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+- Enhancements to Stream VCI and AXI Stream VCs. (:vunit_issue:`420`, :vunit_issue:`422`, :vunit_issue:`429`, :vunit_issue:`483`)
+- Add option 'overwrite' to set_sim_option. (:vunit_issue:`471`)
+- ActiveHDL: add code coverage support. (:vunit_issue:`461`)
+- GtkWave: add sim option 'ghdl.init_file.gui'. (:vunit_issue:`459`)
+- GHDL: add boolean option ghdl.elab_e, to execute 'ghdl -e' only. (:vunit_issue:`467`)
+- GHDL: with VHDL 2008 nonzero return values produce a fail. (:vunit_issue:`469`)
+- Add experimental VHDL 2019 support. (:vunit_issue:`549`)