ENH: Add new message converters in response to feature request #3548.
ENH: Select and lock annotations received by OpenIGTLink
Merge pull request #1 from lchauvin/3548-OpenIGTLink-message-converter-classes

ENH: Select and lock annotations received by OpenIGTLink
Merge branch '3548-OpenIGTLink-message-converter-classes' of https://github.com/tokjun/OpenIGTLinkIF into 3548-OpenIGTLink-message-converter-classes
ENH: Remove deprecated macros from the newly added converter classes.
BUG: Register MRML node classes.
Merge pull request #39 from tokjun/3548-OpenIGTLink-message-converter-classes

3548 open igt link message converter classes