ACalc - An RPN Calculator

20160824 Calc V1.00 (Alpha) features:

• slash commands: /calc show, /calc hide, and /calc config
• titan panel menu item to show/hide the calculator dialog or show the Interface Calc help
• operators for addition, subtraction, multiplication, and division.
• slash command: /calc <expr> where <expr> is in reverse polish notation (e.g. /calc 1 2 + )
• special buttons to retrieve currency values: gold, silver, copper, conquest points, valor points
• special buttons to retrieve health, mana, honor, and achievement points.
• special button to retrieve vpcap (= valor point weekly max - current valor points)
• special button to hide the calculator dialog
• special button to reset the calculator to its default state.