Add the ability to override Tooltip's delay per panel (#1875) Adds the following methods to Panel: ```lua Panel:SetTooltipDelay( delay ) Panel:GetTooltipDelay() ``` Internally this sets the `numTooltipDelay` value on the affected panel. DToolTip's will also have the `OpenDelay` value, which is determined by the above functions, and defaults to the existing convar value.