build: create beta release 0.519.0-beta.0

Update changelog and raise CMake project version to 0.518.90.
7 jobs for wrapland@0.519.0-beta.0 in 27 minutes and 33 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Compliance 1
passed #565192479
clang-format

00:01:49

 
  Build
passed #565192480
Normal build

00:11:39

passed #565192481
Sanitizers build

00:11:12

 
  Compliance 2
passed #565192482
clang-tidy

00:12:58

 
  Test
passed #565192483
Autotests

00:05:09

passed #565192484
Sanitizers

00:05:14

 
  Integration
passed #565192485
Stable image tag trigger

00:01:07