Fix chariot passability class and archer elephant stats

[elexis]

Chariots don't have the large passability class, so they overlap quite heavily. When the unit was considered OP in Alpha 20 and before, this was considered the perfect balancing fix, but for Alpha 21 the situation is different.

We might have to buff their stats perhaps to compensate their reduced ability to stack in a small area.

The same applies to the mauryan elephant archer who received this passability class and is now crappy. The elephant archer inherits the cavalry archer template, thus shares most of the stats (had to reduce walk speed drastically for that reason). But since that animalis huge and since there are two men sitting on that animal, we can justify doubling cost and attack stats to compensate the passability class.

Screenshots by fatherbushido:

[elexis]

Archer elephant buff: ​https://code.wildfiregames.com/D436

[Imarok]

Move tickets to Simulation as UI & Simulation got some sub components.