Nerf timeless

Put a fixed_cooldown flag on Timeless, Metaflow, and Totality (Suncloak, Invigorate, and Temporal Reprieve already have this flag). It will also prevent cooldown_reduction attributes (such as spell_cooldown_reduction) from affecting these talents. It should prevent some of the sillier uses of Timeless (like double Timeless from Metaflow, Timeless and Invigorate, etc.)