CUtlVector containing callbacks (you can have several callbacks for each ConVar).
also, in 'ConVar::InternalSetValue' Valve and Respawn run V_atod (atof) on function param 'pszValue', but they also check if input param 'pszValue' is a nullptr (which in this case, 'pszNewValue' gets set to an empty string), but yet they deref 'pszValue' (nullptr or not) in 'SetColorFromString' and V_atod, is this correct behavior?
For now I swapped these out with 'pszNewValue' for the very rare event the string happens to be nullptr.
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