Deprecate wait() in favour of acquire(), try_acquire(),
try_acquire_for() and try_acquire_until().
Brings Semaphore more into line with CMSIS-RTOS 2 (which uses "acquire"),
itself (as it has "release"), and other classes having "try", "try for"
and "try until".
Also steps away from vague "wait" term - the primary operation here is
to acquire the semaphore, and this will of course sleep.
Static Thread methods and signal methods have been deprecated. Remove
all references in the main code, and most of the tests. Some tests of
the deprecated APIs themselves remain.
Given the 64-bit timebase, add wait_until to ConditionVariable.
Move the timeout example to wait_until(), and give wait_for() an
alternative example, as it's no longer the best option for a
timeout.
Tidy up - remove the redundant RESUME_SIGNAL definition.
Kevin Bracey
Russ Butler