Removed redundant modifiers and made their effects instead scale.

Added German localization thanks to finallyciv.

Added scorched earth mechanics
Added a modifier icon for siege epidemic risk
Minimum army size will now look at the combined total of all besieging armies and not just the current scoped army

Added a modifier icon for siege devastation.
Added a game rule for siege encampments.
Siege encampments go up by level each month of siege and reduce defender advantage by 1. This goes up to level 5 where there's a reduction of 5 defender advantage.

Sieges can now destroy buildings if enabled by a game rule.