Updated TLF SWCs to Build 377.
Removed a workaround in TextGraphic that was a temporary fix for SDK-18880. It is now fixed by the fact that TLF allows FlowElements to be reparented. This workaround was also exposing another TLF problem (that you couldn't use TextLineFactory to re-render a TextFlow after removing its children) reported in SDK-19440; this has also been fixed in TLF.
QE Notes: Please retest bug SDK-18880 to make sure it is still fixed.
Doc Notes: None
Bugs: SDK-18880, SDK-19149, SDK-19440