Version 0.6.11: A few important bug fixes

Hey all! Just a small update here to push a few bug fixes (including one critical one that can break the game in rare instances). Here's the change list:

fixed: the AI would get locked into an infinite loop when swimming with proc gen units generated with the Swimmer trait.
fixed: the counterattacks icon did not display correctly when providing in-shop explanations for why characters wanted Vengeful weapons.
fixed: a range error occurred when a stone golem threw a flying character.
completely overhauled the way the game deals with parabolic movement to improve performance on slower systems (and to thereby avoid weird issues with assassin Leap arcs visibly lagging behind everything else).
overhauled the game's dodge animations so that they, like the new parabola animations, are driven purely by code and math, and so perform much better on older machines.
rewrote the way that the game times combat sequences to end after zooming out the combat camera so as to avoid issues arising from the slowdown in Unity animations on lower-end machines.
cleaned up the timing on character "hop" animations when changing elevation.
received a revised smile for the blacksmith portrait. (The original was just too awkward to use.)
balance change: reduced the number of green allied caravan guards that spawn during caravan defense missions from 4 to 3.
balance change: reduced the chance of a Whetstone appearing in the shop during a given visit from 33% to 10%.
fixed for version 0.6.11a: due to recent changes in the AI code, the game would throw a null error if an enemy drowned to death at the start of the AI's turn.
fixed for version 0.6.11b: it was possible for an AI-controlled character with a preferred area tag and no viable moves to remain on the "calculate a move" list forever despite having no viable moves, thereby preventing the computer from ever ending its turn.

I'll be focused on creating new battles for the update proper near the end of the month. Until then!

--Craig