v0.7.3

Release Notes

• Update README.md
• Add critical_section_enter_cnt_ to posix/pal.c
• Add struct am_ao_state::subscribe_list_set
• Add struct am_queue::ctor_called
• Add AO, onesize, bit and pal documentation to docs/api.rst
• Fix active object restart
• Add event corruption assert to am_h(f)sm_dispatch()
• Improve libs/event/event.h documentation
• Declare struct am_hsm_state::smi as uint8_t
• Remove AO reserved events (subscribe, unsubscribe, unsubscribe all)
• Elaborate am_(h)fsm_dtor() descriptions
• Add examples/fork
• Set AM_EVT_INVALID to -1