v0.6.0

Changes

• Add amast-pragma: verbatim-include-std-on(off) support
• Enable AM_ASSERT_FAILURE in amast_config.h
• Add AM_PAL_MUTEX_NUM_MAX
• Use LTO only for amast.c and amast_test.c
• Add example links for ringbuf and ao modules
• Add repo link to copyright notes
• Add libs/pal/pal.h descriptions
• Add README.rst to ringbuf, onesize, event, timer and ao libs
• Enable optimization, ASAN and USAN