Add notification.Add

[Zaurzo]

This adds a new function Add to the notification library. This serves as a more flexible version of AddLegacy.

number notification.Add( string text, number length = 5, string icon = "vgui/notices/generic", Color color = nil )

Returns the ID of the added notice to use with notification.Kill (if you need to)

Unlike AddLegacy, this isn't restricted to a preset group of icons, and takes a material path, allowing you to give the notice any icon that you want. A color argument is added to change the text color for more customizability. Additionally, the name is shorter, and removes any potential confusion with the name AddLegacy.

I also cleaned up the code a bit and reduced some code copy-paste.

I originally made a PR (#1967) that added a function that would add custom types to use with AddLegacy, but in hindsight, I think it wasn't a very good idea. This PR serves as an improved version of my old one.

Demonstration

local color = Color(200, 255, 200) 

notification.Add('You captured the green flag!', 5, 'icon16/flag_green.png', color)

[Be1zebub]

IMHO notification.Add('You captured the green flag!', 5, 'icon16/flag_green.png', color) would be better.
you need length often than icon, lot of cases you need just notification.Add('You captured the green flag!', 5)