Core/Movement: Replace old TargetedMovementGenerator into ChaseMovementGenerator and FollowMovementGenerator, full rewrite for both.

- Chase to angle is now functional. Pets use this to chase behind the target. Closes #19925.
- Chase to arbitrary range interval works. Not used anywhere, but you can technically make hunter-like mobs.
- Pets now follow the hunter cleanly and without stutter stepping. Also fix some other things. Closes #8924.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/common/Utilities/Util.h b/src/common/Utilities/Util.h
index 1240ce4205f..195aa22ca22 100644
--- a/src/common/Utilities/Util.h
+++ b/src/common/Utilities/Util.h
@@ -89,6 +89,9 @@ inline T RoundToInterval(T& num, T floor, T ceil)
     return num = std::min(std::max(num, floor), ceil);
 }
 
+template <class T>
+inline T square(T x) { return x*x; }
+
 // UTF8 handling
 TC_COMMON_API bool Utf8toWStr(const std::string& utf8str, std::wstring& wstr);