Allow more dialog use of arithmetic, small portal storm rebalance.

[Ramza13]

Summary

None

Purpose of change

Part of #52475
Allow using arithmateic in more places to reduce needed json.
Adjust portal storm values, portal storms are less freqent and shorter.

Describe the solution

Had to move arithmatec from npctalk.cpp to conditions.cpp and switch some uses of talker for dialog which involved a ton of converting over code to use templates. Yeesh I wish there was an easier way.

Describe alternatives you've considered

So many, didn't want to have to refactor this many things but its a gnarly part of code. Maybe should have just ripped out the template stuff.

Testing

Used this json

{
    "type": "effect_on_condition",
    "id": "test",
    "effect": [
      {
        "u_spawn_monster": "mon_absence",
        "real_count": { "arithmetic": [ { "const": 1 }, "+", { "const": 1 } ] },
        "outdoor_only": true,
        "min_radius": 3,
        "max_radius": 20,
        "lifespan": [ "45 seconds", "5 minutes" ],
        "spawn_message": "The very notion of empty space is made a cruel joke.  Nearby nothing becomes even less."
      }
    ]
  },
  {
    "type": "effect_on_condition",
    "id": "test2",
    "effect": [
      {
        "u_spawn_monster": "mon_absence",
        "real_count": { "arithmetic": [ { "arithmetic": [ { "const": 1 }, "+", { "const": 1 } ] }, "+", { "const": 1 } ] },
        "outdoor_only": true,
        "min_radius": 3,
        "max_radius": 20,
        "lifespan": [ "45 seconds", "5 minutes" ],
        "spawn_message": "The very notion of empty space is made a cruel joke.  Nearby nothing becomes even less."
      }
    ]
  }

Additional context