low: add queue implementation

[betula]

const q = queue<Type?>(init?: Type[]);

// q(10); // Think about queue - is a reactive value with set of elements or is the signal for add next one... Hmm.

// q.queue // []

q.front // top
q.back // last element
// q.all // array of elements in queue
q.size
q.clear()

//

q.val
q.first: Value
q.last: Value
q.size: Value
q.active: Value
q.clear()

// Support queue for q.wrap and q.view // think about api
// val: <array_of_elements> readonly
// q(<new_element>)

Or q() - no possible, but 

q.add(value: Type)
q.val: Type
q.first: Value
q.last: Value
q.size: Value
q.active: Value
q.clear()

// How I can make queue with limited size same as in my swipe impl?

q = queue();

q(values: Type[]);
q.set(values: Type[]);
q.update(...);
q.val: Type;

q.add(value: Type);

q.first: Value
q.last: Value
q.size: Value
q.active: Value
q.empty: Value
q.clear()

//

const t = q.first

t.val: Type
t.started: Value
t.start();
t.release(); // remove item from queue (or dequeue)

// or

t.val: Type
t.start: ready(false).to(true)
t.remove(); // remove item from queue // or ready(false).to(true) too

[betula]

Decorating add signal

const q = queue<Type>([], (queue, value: Type) => {
  const excluded = queue.slice(3);
  // const data = queue..
  // How to convert value to queue element?
});

const q = queue<Type>();
q.before (Signal)

q.before((value) => {
  stoppable.stop();
  transaction
  check q
  remove unnecessary q elems
  add new
  finish transaction
});

Task added https://github.com/betula/realar/issues/67

[betula]

Added to "the stream of conciseness 0.7+ roadmap"