Sunset MathTable, created MTFontV2, MTFontMathTableV2 and MathImage, about to sunset MTMathImage

Sources/SwiftMath/MathBundle/MTFontMathTableV2.swift

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+//
+//  MTFontMathTableV2.swift
+//  
+//
+//  Created by Peter Tang on 15/9/2023.
+//
+
+import Foundation
+
+// extension MathTable {
+//     public func fontMathTableV2() -> MTFontMathTableV2 {
+//         MTFontMathTableV2(mathFont: font, size: fontSize)
+//     }
+// }
+internal class MTFontMathTableV2: MTFontMathTable {
+    private let mathFont: MathFont
+    private let fontSize: CGFloat
+    private let unitsPerEm: UInt
+    private let mTable: NSDictionary
+    init(mathFont: MathFont, size: CGFloat) {
+        self.mathFont = mathFont
+        self.fontSize = size
+        mTable = mathFont.mathTable()
+        unitsPerEm = mathFont.ctFont(withSize: fontSize).unitsPerEm
+        super.init(withFont: mathFont.mtfont(size: fontSize), mathTable: mTable)
+        super._mathTable = nil
+        // disable all possible access to _mathTable in superclass!
+    }
+    override var _mathTable: NSDictionary? {
+        set { fatalError("\(#function) change to _mathTable \(mathFont.rawValue) not allowed.") }
+        get { mTable }
+    }
+    override var muUnit: CGFloat { fontSize/18 }
+    
+    override func fontUnitsToPt(_ fontUnits:Int) -> CGFloat {
+        CGFloat(fontUnits) * fontSize / CGFloat(unitsPerEm)
+    }
+    override func constantFromTable(_ constName: String) -> CGFloat {
+        guard let consts = mTable[kConstants] as? NSDictionary, let val = consts[constName] as? NSNumber else {
+            return .zero
+        }
+        return fontUnitsToPt(val.intValue)
+    }
+    override func percentFromTable(_ percentName: String) -> CGFloat {
+        guard let consts = mTable[kConstants] as? NSDictionary, let val = consts[percentName] as? NSNumber else {
+            return .zero
+        }
+        return CGFloat(val.floatValue) / 100
+    }
+
+}