Extend LuaSchedule with bulk operations

[LuziferSenpai]

Hey,

I love the LuaSchedule, but I'm mussing bulk operations a bit.

So what I would want to have is:

• get_interrupts
  returns a array/table of all the interrupts
• add_interrupts
  lets you add all the interrupts inside a array/table at once

For now I only have these two, but there could be more.

Greetz,

Luzifer

[Rseding91]

I added get/set/clear interrupts and records for the next release.