Ability to reorder charges

[janithl]

Right now, charges need to be cloned to be brought to the top of the stack.

We might want to consider how we display charges in order and how we can reorder them.

[janithl]

Proposed new charges UI, which is similar to the pattern used in Photoshop and other image editors.

Advantages:

• ✅ Give users a visual overview of their design
• ✅ Allow them to reorder charges
• ✅ Leave door open for future enhancement to nest charges under cantons, shields etc.