Rename package to swift-mustache (#27)

* Rename package to swift-mustache

* Update CI

Sources/Mustache/String.swift

@@ -0,0 +1,38 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Hummingbird server framework project
+//
+// Copyright (c) 2021-2021 the Hummingbird authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See hummingbird/CONTRIBUTORS.txt for the list of Hummingbird authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+extension String {
+    private static let htmlEscapedCharacters: [Character: String] = [
+        "<": "&lt;",
+        ">": "&gt;",
+        "&": "&amp;",
+        "\"": "&quot;",
+        "'": "&#39;",
+    ]
+    /// HTML escape string. Replace '<', '>' and '&' with HTML escaped versions
+    func htmlEscape() -> String {
+        var newString = ""
+        newString.reserveCapacity(count)
+        // currently doing this by going through each character could speed
+        // this us by treating as an array of UInt8's
+        for c in self {
+            if let replacement = Self.htmlEscapedCharacters[c] {
+                newString += replacement
+            } else {
+                newString.append(c)
+            }
+        }
+        return newString
+    }
+}