Update UserAllocatedEvent.h

Update Event.h

Update equeue.h

Update EventQueue.h

Update equeue.h

Update README.md

Update README.md

Update README.md

extend the event generation int

bigger equeue generation size and only increment when needed ...

to mitigate against generation clash

Merge pull request #13975 from adbridge/eventq ...

Update EventQueue API to use chrono times

Remove trailing space

Tweak events API update and update Greentea tests accordingly

CMake: rename greentea test macro

Merge pull request #14087 from adbridge/events ...

Update events period method to check for invalid values

Minor formatting tweak to fix file permissions

Revert "one final whitespace change!" ...

This reverts commit c9a3375.

one final whitespace change!

Further whitespace fixes

Fix whitespace to stop astyle complaining

Fix astyle issues

Remove unecessary namespace qualified ...

(Also minor whitespace correction)

Apply suggestions from code review ...

Co-authored-by: Hugues Kamba <41612201+hugueskamba@users.noreply.github.com>

Fix some whitespace issues

Updated event period handling and greentea test ...

non_periodic constant has been moved out of the Event class and
made static within the events namespace so that it is available
both internally within the class and externally.

The MBED_ASSERT has been changed to MBED_WARNING.

The greentea test has been updated:
1) timings reduced to make the test cases run faster
2) The call handler simplified

Update events period method to check for invalid values ...

The period method currently allows any ms value positive, negative
and zero. A negative value means dispatch a non periodic event
ie just once. 0 is unspecified behaviour. This commit forces the
user to use either positive periods or a new constant non_periodic
and should any other value be provided will default to
non_periodic.

A Greentea test case is also provided to check this works as
expected.

CMake: Add CMake support for events greentea test

Review feedback - capitilise argument descriptions

Update Event period and delay parameter comments

Fix the time units stated in the delay and period functon headers ...

delay() and period() still stated that the units were milliseconds
whereas in fact they are now a Chrono duration.