Bump GUI version to v0.5.5.3

Bump GUI version to v0.5.5.2

Fix splitter state restoration at start of acquisition

Update README

Bump GUI version to v0.5.5

Update README

Merge pull request open-ephys#443 from medengineer/fix-msg-center

Add missing return value to RecordNode::disable()

Bump GUI version to v0.5.4

Bump GUI version to v0.5.3.1

Merge pull request open-ephys#412 from medengineer/development

Update Record Node editor when number of input channels updated