Support link/html in analytics prompt strings.

Show the new prompt to everyone, even if they previously opted out.
Add docs to Analytics.

RiotSwiftUI/Modules/AnalyticsPrompt/View/AnalyticsPromptTermsText.swift

@@ -26,17 +26,49 @@ struct AnalyticsPromptTermsText: View {
     
     @Environment(\.theme) private var theme
     
-    // MARK: Public
+    /// A string with a link attribute.
+    private struct StringComponent {
+        let string: String
+        let isLink: Bool
+    }
     
-    let promptType: AnalyticsPromptType
+    /// Internal representation of the string as composable parts.
+    private let components: [StringComponent]
     
-    // MARK: Views
+    // MARK: - Setup
+    
+    init(attributedString: NSAttributedString) {
+        var components = [StringComponent]()
+        let range = NSRange(location: 0, length: attributedString.length)
+        let string = attributedString.string as NSString
+        
+        attributedString.enumerateAttributes(in: range, options: []) { attributes, range, stop in
+            let isLink = attributes.keys.contains(.analyticsPromptTermsTextLink)
+            components.append(StringComponent(string: string.substring(with: range), isLink: isLink))
+        }
+        
+        self.components = components
+    }
+    
+    // MARK: - Views
     
     var body: some View {
-        let (start, link, end) = promptType.termsStrings
-        
-        Text(start)
-            + Text(link).foregroundColor(theme.colors.accent)
-            + Text(end)
+        components.reduce(Text("")) {
+            $0 + Text($1.string).foregroundColor($1.isLink ? theme.colors.accent : nil)
+        }
+    }
+}
+
+// MARK: - Previews
+@available(iOS 14.0, *)
+struct AnalyticsPromptTermsText_Previews: PreviewProvider {
+    
+    static let strings = MockAnalyticsPromptStrings()
+    
+    static var previews: some View {
+        VStack(spacing: 8) {
+            AnalyticsPromptTermsText(attributedString: strings.termsNewUser)
+            AnalyticsPromptTermsText(attributedString: strings.termsUpgrade)
+        }
     }
 }