Provide compareHighPrecision() for any code that needs higher precision comparisons.
git-svn-id: https://svn.eduke32.com/eduke32@8064 1a8010ca-5511-0410-912e-c29ae57300e0
Using that higher precision, interpolate at a higher granularity.
Further, truncate the target interpolation time to vertical blank boundaries to avoid producing temporal artifacts.
Fix issues caused by interpolation calculations being handled differently in multiple places (and fix cases where smoothratios were being thrown away only to be redone without checking all proper conditions).
Ensure ClockTicks changes do not break other targets (EKenBuild, VoidSW), but note any interpolation there is not similarly updated.
git-svn-id: https://svn.eduke32.com/eduke32@8050 1a8010ca-5511-0410-912e-c29ae57300e0
# Conflicts:
# source/build/src/build.cpp
# source/build/src/sdlayer.cpp
