Removed SMPTE classes from libutil
typedesc: Removed VEC7 from AGGREGATES. Made TypeTimeCode and TypeKeyCode into arrays instead of aggregates, and fixed their string representation
EXR output: Modified TimeCode and KeyCodes to be read as arrays rather than aggregates
DPX input: Removed SMPTE classes. Added helper functions as replacements for required functionality.
DPX output: Removed SMPTE class. Added helper function as replacement for required functionality.