Change how the Mac modifiers are stored

Since babel + almond.js seems to mangle \u unicode strings for some reason, store the mappings from characters like ^ to "Ctrl" as an array of code points and generate the strings at runtime.
Use Object.assign instead of spread operator, to avoid complaints from r.js.
Add /dist to .gitignore.

.gitignore

@@ -1,5 +1,6 @@
 /build/build.txt
 /build/rjs
 /build/out
+/dist
 /node_modules
 /release

src/js/background/get-chrome-shortcuts.js

@@ -7,58 +7,46 @@ define([
 ], function(
 	cp
 ) {
-	const KeyAliases = {
-		"Left Arrow": "ArrowLeft",
-		"Right Arrow": "ArrowRight",
-		"Up Arrow": "ArrowUp",
-		"Down Arrow": "ArrowDown",
-		"Page Up": "PageUp",
-		"Page Down": "PageDown",
-		"Ins": "Insert",
-		"Del": "Delete",
-		"Comma": ",",
-		"Period": ".",
-		"Media Previous Track": "MediaTrackPrevious",
-		"Media Next Track": "MediaTrackNext",
-		"Media Play/Pause": "MediaPlayPause",
-		"Media Stop": "MediaStop",
-			// Unicode chars used as keys show up as broken chars in Chrome after
-			// r.js combines the files, possibly only after adding bluebird.min.js
-//		"←": "ArrowLeft",
-//		"→": "ArrowRight",
-//		"↑": "ArrowUp",
-//		"↓": "ArrowDown",
-//		"⌃": "Ctrl",
-//		"⇧": "Shift",
-//		"⌥": "Opt",
-//		"⌘": "Cmd",
-			// babel converts these back to single chars during the build
-//		["\u2303"]: "Ctrl",
-//		["\u21E7"]: "Shift",
-//		["\u2325"]: "Opt",
-//		["\u2318"]: "Cmd",
-//		"\u2303": "Ctrl",
-//		"\u21E7": "Shift",
-//		"\u2325": "Opt",
-//		"\u2318": "Cmd",
-	};
+	const fromCodePoints = (entries) => entries
+		.map(([codePoint, alias]) => [String.fromCodePoint(codePoint), alias]);
+
+	const KeyAliases = Object.assign(
+		{
+			"Left Arrow": "ArrowLeft",
+			"Right Arrow": "ArrowRight",
+			"Up Arrow": "ArrowUp",
+			"Down Arrow": "ArrowDown",
+			"Page Up": "PageUp",
+			"Page Down": "PageDown",
+			"Ins": "Insert",
+			"Del": "Delete",
+			"Comma": ",",
+			"Period": ".",
+			"Media Previous Track": "MediaTrackPrevious",
+			"Media Next Track": "MediaTrackNext",
+			"Media Play/Pause": "MediaPlayPause",
+			"Media Stop": "MediaStop",
+		},
+			// Unicode chars used as keys show up as broken chars in Chrome
+			// after r.js and babel combine the files.  so build the lookup table
+			// at runtime from the code point values, to avoid depending on a
+			// string like "\u2190", which also gets mangled.
+		Object.fromEntries(fromCodePoints([
+			[0x2190, "ArrowLeft"],  // ←
+			[0x2192, "ArrowRight"], // →
+			[0x2191, "ArrowUp"],    // ↑
+			[0x2193, "ArrowDown"],  // ↓
+			[0x2303, "Ctrl"],       // ⌃
+			[0x21E7, "Shift"],      // ⇧
+			[0x2325, "Opt"],        // ⌥
+			[0x2318, "Cmd"]         // ⌘
+		]))
+	);
 	const ShortcutSeparator = "+";
 	const ShortcutSeparatorPattern = /\s*\+\s*/;
-	const MacShortcutPattern = /([\u2303\u21E7\u2325\u2318]+)(.+)/;
 		// Unicode chars in a regex also show up broken
 //	const MacShortcutPattern = /([⌃⇧⌥⌘]+)(.+)/;
-
-		// the only way to prevent babel from converting the \u strings to
-		// literal chars seems to be to set the keys this way after the object's
-		// been created
-	KeyAliases["\u2190"] = "ArrowLeft";
-	KeyAliases["\u2192"] = "ArrowRight";
-	KeyAliases["\u2191"] = "ArrowUp";
-	KeyAliases["\u2193"] = "ArrowDown";
-	KeyAliases["\u2303"] = "Ctrl";
-	KeyAliases["\u21E7"] = "Shift";
-	KeyAliases["\u2325"] = "Opt";
-	KeyAliases["\u2318"] = "Cmd";
+	const MacShortcutPattern = /([\u2303\u21E7\u2325\u2318]+)(.+)/;
 
 	return function getShortcuts()
 	{