Create TimedEvent Child RecurringEvent

[Zomon333]

We need a TimedEvent that both returns the value expected at a certain time, but also schedules itself to run again. Further requirements will be posted after TimedEvent's implementation.

[Zomon333]

• [x] RecurringEvent must have 4 constructors:
  • [x] RecurringEvent()
  • [x] RecurringEvent(F, period)
  • [x] RecurringEvent(Event, period)
  • [x] RecurringEvent(TimedEvent, period)
• [x] All RecurringEvent may return int. This is not indicative of a result but instead a status.
• [x] RecurringEvent must have recursion control functions:
  • [x] recur(Parameters... params) must begin the cycle of recurring
  • [x] end(Parameters... params) must end the cycle of recurring and return the status
  • [x] localDefer(Parameters... params) for internal use, as a single-threaded deferral
• [x] RecurringEvent must have recursion mutators and accessors
  • [x] getTime(), setTime()
• [x] RecurringEvent may benefit from a locally scoped variable system, like unordered_map<string, void*>. This must be used with caution.

I'm sure more will follow throughout development.

[Zomon333]

I've decided RecurringEvent wold not benefit from a locally scoped variable system. If people want to add their own variables to their events, they can send references in through parameters.

[Zomon333]

I've decided engine Unit Time is milliseconds and the engine Unit Frequency is 100 HZ. Fight me.

[Zomon333]

Resolved with commit 013a8497e2087c33f63e8b55798eb78d0bbba2f7.

Awaiting unit tests.