GitLab

- invert the silent flag to a verbose flag
  (verbose is usually not what you want)
- add overlap flag for starting alarms immediately after creating them

- rename function to alm_test_create_event
- add parameter for delay, defaulting to 1 second
- clean up alarm and event

- no longer use a function table but call timer functions directly
  as with other libraries; function names start with "timer_"
- renamed most modules to allow simplifying the Makefile
- renamed files so they start with timer
- removed some files that are no longer needed

As the comment in the code says, delays greater than MAX_DELAY can be simply
ignored, since MAX_DELAY is so far in the future it makes no difference in
practice. However, the semantics of alm_start is such that an already
started alarm is canceled, thus we need to cancel it in this case, too.

The macro did not work because for some architectures
epicsEventSignal is implemented as a macro.

Posix semaphores are only used in macro alm_create_sem,
user code that wants to call this macro has to include
semaphore.h anyway.