Separate UI instead of post macro

[haliphax]

I plan on breaking the dice roller out into its own UI instead of using a post macro. This will include at least:

• Sets of die rolls (e.g., 3d20, 4d6, etc.) and modifiers (e.g., +4, -3)
• Keep highest n, drop lowest n
• Descriptions (e.g., "Initiative", "Acrobatics")
• Templates (e.g., Advantage for 2d20 drop lowest 1, Disadvantage for 2d20 drop highest 1)

I'd like for these to be in a pop-out dialog instead of redirecting the user to another URL.