[Request] Allow any weapon to have any skin

[TheZZL]

Title, if this were to be possible I think that would be a great customizability option. In weapons_english.cfg changing the weapon class to include other weapons does not do this. Thank you for considering this!

[rpkaul]

@TheZZL try this https://github.com/BoneTM/weapons

[crashzk]

@kgns currently this feature is already possible to a certain extent, for example if I want the Spirit Board skin of the Sawed-Off weapon to work on all weapons, knives and C4, just put the name of all weapons in the classes correct?

"Spirit Board"
{
	"index"		"1140"
	"classes"	"weapon_sawedoff;"
}

My question would be, is it possible for you to implement the all option for classes and thus already add all skins, instead of adding the weapon name one by one.

Did you understand more or less?

That is, instead of adding in classes all the weapons that I would like to put in this skin I would just write all in classes and all weapons would already have access to that skin.

[crashzk]

Test: #271