Make buttons more self explanatory

[arcusmaximus]

For a first-time user of the extension, the current Advanced Mapping toolbar probably looks like this: 🔼 Move up ❌ Delete 🔽 Move down 🔄 Refresh (just like all the other 🔄 buttons in Forge)

Then, they (maybe) hover over the buttons to look at the tooltips, and find out that three of them actually do something completely different.

Suggestion 1: use text instead of icons.

Suggestion 2: add a ➕ button for adding a row at the bottom, turn the 🔼/🔽 buttons into Move buttons, and find a better icon (or use text) for the Reset button.