MythZoneMinder: add some initial support for ZoneMinder >= 1.26.0

Thanks to Warpme for testing the patch.

Note: this bumps the MythZoneMinder protocol version so both the FE plugin
and mythzmserver need to be updated.

(cherry picked from commit 39401bfb8de62852679564bb518e2c8a57b4c01c)
MythZoneMinder: Add six and eight camera layouts to the live view screen

The live view can now show 1, 2, 4, 6, or 8 cameras at the same time.

Note to themers: You will need to add the new layouts to the zmliveplayer
window definition if you have themed it.

(cherry picked from commit 02c66c8d61e4adaade50a41922ccf0f2c6820b11)
MythZoneMinder: Add the six and eight camera layouts to the 4:3 ZM live screen

(cherry picked from commit 29cc89dbaa955d3cda1212ec0f648dfd8f0108df)
MythCenter-wide: Add the six and eight camera layouts to the ZM live screen

(cherry picked from commit bb66f3156605ac288cc2777c8530c25ed80908aa)
MythZoneMinder: tidy up the default wide zmliveplayer

(cherry picked from commit e43fbd4ef7f1879c69812721ba5b45633ea5c556)