core: Runtime allocator & Event dispatcher

[Cassolette]

This component is very important to the core operation of BT (or any mousebase-based modules). Similar to the Event Loop of NodeJS, this library is responsible for:

• Ensuring runtime usage stays in a healthy range
• Events are postponed when free runtime is running low
• Async operations (core: Promise + Async / await library #4) and/or events are run in an unproblematic manner

For the last point, consider the following snippet:

btp:setLanguage(language)

-- Because of the synchronous manner in which the above function is executed and this event is emitted,
-- the below will not run in time
btp:once('languageChanged', function()
      btp:tlbChatMsg(LOCBUILDER_CHANGED_LANG)
end)

By using the flow in which Node handles sequencing, we are able to queue the emission of languageChanged after the current task is completed, as a microTask (see process.nextTick).