Release v3.0.3

Minor release with a few fixes required for rust development to progress

Enhancements:

• make: Add support for make install
• api: cp: Add method to flush command queue
• python: osdp_sys: Add some error context for public API
• doc: Add libosdp/compatibility to top level index.rst

Fixes:

• doc: Fixup doc in multiple places
• api: More doxygen fixups
• cmake: Fix packet trace and data trace linkage
• api: Fix regression caused by doxygen formatting commit
• api: Fix doxygen comments style all over osdp.h
• Fix minor typos in the Wireshark payload dissector
• doc: More README updates
• doc: Update README; fix compatibility table
• libosdp: Fix issue with SC retry timer
• utils: Pull in fix for time usage on Windows