Stack-allocate Kaidan object again

* Was only changed to heap because I thought the QQmlEngine needed to delete it
* Now I know about CppOwnership.

The Kaidan class should be small enough to be stack allocated, it's mostly a collection of pointers, four QStrings and some numbers (enums, bool, int)
3 jobs for stack-kaidan-object in 1 minute and 54 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #65818
build

00:01:44

passed #65816
clazy

00:01:54

passed #65817
qmllint

00:00:34