Add cookie banner

src/utilities/cookie_handler.ts

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+export function shouldShowCookie():boolean {
+    return localStorage.getItem("cookie") == undefined;
+}
+
+export function acceptCookie():void {
+    localStorage.setItem("cookie", "accept");
+}
+
+export function refuseCookie():void {
+    localStorage.setItem("cookie", "refuse");
+}

src/utilities/random.ts

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+export function randomOfArray<T>(array:T[]):T {
+    return array[Math.floor(Math.random() * array.length)];
+}
+
+export function random(min:number, max:number):number {
+    return Math.random() * (max - min) + min;
+}
+
+export function randomInt(min:number, max:number):number {
+    return Math.floor(random(min, max));
+}