Bind Layer system

[yellowberryHN]

Bind system should be reworked to support creating new bind layers (configurable per layer for either override or overlay), assigning binds to layers, activation and deactivation of selected layers, and so on.

As for gamemode specific binds, use specific command to assign layer name to gamemode

Some ideas for syntax:

// create new layer (optionally override layer)
addlayer "swap" [0|1]

// remove layer
removelayer "swap"

// add bind to layer
layerbind "swap" SPACE [setweapon FI; onrelease ]

// activate layer
enablelayer "swap"

// disable layer
disablelayer "swap"

// check layer state (result is 0|1)
getlayer "swap"

// check layer type (result is 0|1)
getlayertype "swap"

// helper for bind to toggle layer
togglelayer "swap"

// helper for bind for layer activation when held
heldlayer "swap"