A think hook for panels using ConVars as a value. Call it in the Think hook. Sets the panel's value should the convar change.
This function is best for: text inputs, read-only inputs, dropdown selects
For a number alternative, see Panel.ConVarNumberThink.
Important: Make sure your Panel has a SetValue function, else you may get errors.
How it should be implemented into your input.
function PANEL:Think() self:ConVarStringThink() end