More Spawn Menu Customization

[Zaurzo]

This pull request aims to add more customization to the spawn menu.

Sub category headers for NPCs, Weapons, Entities, and Vehicles

This adds SubCategory to the ENT and SWEP structs.

Example

(This pull request does not add these headers to any of the default NPC categories. This is just a demonstration.)

Ability to easily add options to the right click menu for Content Icons and Spawn Icons

Adds two hooks and one function to achieve this:

• GetOpenDermaMenus() function
• OnContentIconOpenMenu hook
• OnSpawnIconOpenMenu hook

Example
Code:

hook.Add('OnContentIconOpenMenu', 'CopyName', function(icon, menu)
    if icon:GetContentType() ~= 'npc' then return end

    menu:AddOption('Copy Name', function()
        SetClipboardText(language.GetPhrase(icon.m_NiceName))
    end):SetIcon( "icon16/page_copy.png" )
end)

Output:

Custom spawn list ordering for NPCs, Weapons, Entities, and Vehicles

This adds SpawnListOrder to the ENT and SWEP structs. This determines the order in which the icons will be created in. This mixes well with the default alphabetical ordering.