The DisplayPort multi stream path should be more stable in comparison to
connector names, so prefer that for differentiating between outputs with
the same EDID.
BUG: 470718
Instead of an external service (like KScreen) storing and restoring output configurations,
with this commit KWin takes over that responsibility. This allows it to, among other things,
generate appropriate configs for new sets of outputs immediately, and take KWin-internal information
about outputs into account when generating them.
CCBUG: 474021
CCBUG: 469653
CCBUG: 466342
CCBUG: 470863
CCBUG: 466556
BUG: 466208
BUG: 455082
BUG: 457430
As a first step to move away from having an external service remember output settings
for KWin, this commit introduces an output manager that can load configuration files
and generate new output configurations.
