[PATCH] Remove EntityLimitsChanger

[sanderd17]

The EntityLimitsChanger component is unnecessary.

Instead, the information should be present in the EntityLimits component. The base working should be with classes, and every time a new entity is made (or one is destroyed), the limit should be checked.

As extension, the limit tooltip should be extended to include the classes that are limiting the creation of that entity.

[historic_bruno]

How the new EntityLimits could look:

  <EntityLimits>
    <LimitMultiplier>1.0</LimitMultiplier>
    <Limits>
      <DefenseTower>30</DefenseTower>
        ...
      <Library>1</Library>
      <Field>
        <Limit>0</Limit>
        <CategoryLimits>
          <Farmstead>8</Farmstead>
        </CategoryLimits>
      </Field>
      <Lighthouse>1</Lighthouse>
    </Limits>
  </EntityLimits>

[ben]

In 13964:

Reverts field limits from r13909 until we can fix AI and UI problems, refs #2187

[sanderd17]

I opted to put it in a separate list, as IMO it wasn't nice to have a difference between <Cat>5</Cat> and <Cat><Limit>5</Limit></Cat>.

The UI is also automatically updated, and the AI can access the information.

[sanderd17]

In 14408:

define the limit changing elements together with the limits, so they can be queried by the GUI and the AI. Fixes #2187