EMI: Allow nil X, Y and Z values in SetActorHead.

This fixes Deadeye Dave's animation in pop.
EMI: If the head joint name is empty, don't do head tracing.
Merge pull request #962 from Akz-/emi-head-fixes

EMI: Fix Deadeye Dave's head
DEVTOOLS: it's not needed add non source code files into mdvc project
DEVTOOLS: disable build MT32 with msvc