minor code optimizations to get rid or clang warnings
renamed all AOS_SYSTEM_EVENTFLAGS_... macros for better consistency
Renamed all GPIO related signals etc. from "...io..." to "...gpio..."
Shell is not implicitly enabled when tests are activated anymore.
aos_time.h: added comments to all macros.
Introduced a function to initialize aos_testresult_t objects: aosTestResultInit()
Makefiles revisedAMiRo-LLD updated
fixed some typos in comments
aosSysGetStdIntCallback() function renamed to aosSysGetStdExtiCallback()
minor enhancement to the set date/time shell command output
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