refactor: moved components to separate modules

`content.ts` is now half less than the size, exported functions can be unit tested

src/content/utils/formatting.ts

@@ -0,0 +1,28 @@
+import { conversion_ref_usd } from '../config';
+import { $T } from './localization'
+
+function toFixed(num: number, fixed: number) {
+	var re = new RegExp('^-?\\d+(?:\.\\d{0,' + (fixed || -1) + '})?');
+	return num.toString().match(re)[0];
+}
+
+export function formatPrice(keys: number, metal: number, keyPrice: number, locale: string = 'en') {
+	const pureMetal = (keys * keyPrice) + metal;
+	const formattedKeys = +(keys + (metal / keyPrice)).toFixed(2)
+
+	var output: string = ''
+	if(keys > 0) {
+		output += (formattedKeys == 1.0 ? $T("%@ key") : $T("%@ keys")).replace('%@', formattedKeys.toLocaleString(locale))
+	} else {
+		output += `${(+toFixed(metal, 2)).toLocaleString(locale)} ref`
+	}
+	const currencyFormatter = new Intl.NumberFormat(locale, {
+		minimumFractionDigits: 2,
+		maximumFractionDigits: 2,
+ 	});
+
+	// Round price up to nearest cent
+ 	const price = Math.ceil(pureMetal * conversion_ref_usd * 100) / 100
+	output += ` (US$${currencyFormatter.format(price)})`
+	return output;
+}