[Practice Mode] Add HP/MP Regen disable / dummy unit
This is a minor thing, but I would think it's the bee's knees if we had an option to disable HP/MP regeneration in practice mode. A dummy hero with exactly 1000 HP would be great too.
This would come in useful ,for example, to see hard numbers on how Codex scales with Cursed Ground, or exactly how much damage mana burn deals in relation to magic damage, after armor reductions. I can see many guide writers finding this very useful.