Fix StreamReader.Reset to also reset StreamReader.CurrentTime
Fix ttyrec/ttyrec2 Reset() function
Added ResettableRecordingReader interface and O(1) implementations
Fixed record suffix checking for payloads above 127 bytes
Make Width/Height/StartOfRecording public on asciicastv2 writer
Add MakeReaderWithTagCallbacks for more control
Allow querying indicies for registered callbacks
Augmenting "register" callback now supported
Added terminal utilities for determining head time, concatenation, extracting payload streams for each channel, and extracting window dimensions.