Removed the limitation of 4 tabs & Resizing the Navbar.

[abdulwahid24]

Hi,

Based on reported issues related to 4 tabs limitations. I have removed the 4 tabs limitations so that people can create as many as tabs they want.

The only concern was the size of the bottom navbar, So I have resolved that part by making the size flexible by adding the below-mentioned parameters.

      this.circleSize = 60,
      this.arcHeight = 70,
      this.arcWidth = 90,
      this.circleOutline = 10,
      this.shadowAllowance = 20,
      this.barHeight = 60,

Now, The default size will be there and user can adjust the size as well.

I hope this will be useful and resolved many reported issues.
@tunitowen Please review the PR and let me know in case of any questions.

Thanks,
Abdulwahid Barguzar