Notifications rewrite + small fixes

[patrick11514]

• Added ability for SuspensionWrapper to pass rest of props to child
• Moved utilities.ts file to folder called utilities and renamed it to utils.ts to maintain some folder structure, that having everything in src folder
• Added getDataWithCSRF, which just fills the header X-CSRFToken and then call getFromAPI. This is alternative to fetch function in api.js (also swapped order of parameters of getFromAPI from url, data, method, headers to url, method, data, headers, beacause we usually want to specify method first and then data (if any).
• Ported Notifications and refactored code a little bit + fixed Notifications are not scrollable #455 by setting max height to 50vh, if exceeded, notifications list is scollable
• Added ability to switch between old layout (currenly only Notificaions), with cookie newUI. If set (technically to any value), then new Vue components are used, when 0 or not presented, then old Svelte components are used. When notification will be tested in production, then we can just remove the svelte version and remove the condition in front of Vue version.

[Kobzol]

Looks great! Left a few nits, and style/lints need to be fixed.

I realized that there's a lot of duplicated code with Svelte now. Since the component seems to work well, let's just nuke the old Svelte code and notifications code, to avoid having two copies there.

But please still keep the newUI logic, we will use it in the future for more complicated components.

[Kobzol]

I will do some push notification fixed on top of this PR (#557) once this is merged.

[patrick11514]

I realized that there's a lot of duplicated code with Svelte now. Since the component seems to work well, let's just nuke the old Svelte code and notifications code, to avoid having two copies there.

I just looked into svelte files, and we can only remove Notifications.svelte file, becuase notifications.js is also used here

[Kobzol]

Just out of curiosity, is Svelte (+ our build system) unable to import code from .ts files? Or perhaps use the .js prefix when referring to TS files?

[patrick11514]

Okay, so importing typescript files into svelte works, so I removed the old js and svelte file and changed the import in TaskDetails and also tested it.

[Kobzol]

Ok, awesome :) Thank you, this is great!