[JW Lua] FCShapeExpressionDefs and FCTextExpressionDefs compatibility

[Jan Angermüller]

Jari,

in FCShapeExpressionDefs some "playback type detection" functions are 
missing to be compatible with FCTextExpressionDefs:
for example Set/GetPlaybackDuration, Set/GetPlaybackValue, 
SetPlaybackController.
So currently it's possible to read the playback settings of text 
expressions, but not of shape expressions.

All the best,
Jan