Added feature -
Modifiers are now remembered (along with the dice).

So you can save things like 3d6+6 now.

Initial release

Use-cases

1) Pick your dice
Click on the dice selection buttons at the top to select which dice you want to roll, and how many.
Left click to add dice, right click to remove dice.

2) Add your modifiers
Click on the Mod buttons to the right.
Right click to increase, right click to decrease.

3) Roll!
Click Roll to perform a roll of the selected dice with the selected modifier.

4) Remember
If you want to save a roll, input the name of the preset into the Name field in the bottom right,
and then click on an empty memory slot.
Pressing a non-empty memory button will perform the roll again.

5) Forget
If you need an empty slot, click on Memory CLEAR button, then on an occupied slot.

6) Modify
When a memory slot is clicked, the dice saved into the slot are displayed on the counters above.
If you want to alter the contents of the slot, simply change the counters after clicking the memory slot,
then clear the saved slot (see 5 - Forget) and click on the now-empty slot.