mythzmserver: fix a possible segfault if no event frames are found
Services: Add GetInputList() endpoint
configure: bump the minimum supported taglib version to 1.7

Version 1.8 or later is recommended but Myth will compile using 1.7 but
with reduced functionality.
mythzmserver: add the sub pixel order to the monitor debugging

Refs #11957.
mythzmserver: use the frame size from the shared memory in ZM 1.26.x

Refs #11957.
Merge remote-tracking branch 'upstream/master'