Alpha 21

Development started by ​Wildfire Games on April 2^nd 2016 (r17966).
The most recent revision can be found at ​http://trac.wildfiregames.com/changeset

The following list highlights the most important changes (more noticeable ones first):

Gameplay & Balancing

r18024 Make unused buildings and champions available:

Athen and sparta can build up to two royal stoa and produce sword- and skirmisher-infantry-champions there
Britons can build a crannog, which is both a civic-center and a dock
Persians can build halls from which spear- and skirmisher-infantry-champions and war-elephants can be produced
Romans can build (at most one) Temple of Vesta, persians a gate, which increases the catpure-strength of garrisoned units within 75m of the temple
Athen, carthaginian, macedonian, roman, spartan and ptolemian wonders are temples, thus heal nearby (60m) and garrisoned units
Iberian monument can't be captured anymore

r17974 Owning multiple wonders gives multiple population boni (#3522 #3792)
r18021 Technologies can be researched on captured buildings
r18025 Nerf champions:

Reduce armour by 1-2 levels, rougly 25% more build cost and take twice the time to train
Researching the tech to build champions from barracks costs 1000 metal

r18037 Increase siege armour by 2 levels, add 50% more health, let them regenerate capture-points and reduce packtime
r17999 Defense tower techs don't affect wall-turrets anymore
r17970 Reduce wall-tower range from 88m to 72m, increase minimum distance from 3m to 12m
r18008 Corrals: Britons, Gauls and Iberians produce pigs, Carthaginians, Mauryans and Ptolemians produce goats
r18004 Dropsites shared by default
r18007 Allow sharing/unsharing multiple dropsites simultaneously

User Interface

r18014 Improve selection ring of animals (#3786)
r18026 Correct team totals for the summary screen
r18031 Link from summary screen to replay

Petra AI

r17971 Use corrals with low starting resources

Engine

r17975 Cinematic paths: interpolate camera rotation

Performance Optimizations

r18011 Slight improvement of flood-fill algorithm of the hierarchical pathfinder