KQuickImageEditor in KDEReview

[Harald Sitter]

- really close to 100% reuse cover. plz consider adding data to
KQuickImageEditorConfig.cmake.in and src/controls/plugins.qmltypes
- in fact... shouldn't the qmltypes file be generated at build time?
- there's commented out KDEFrameworkCompilerSettings in CMakeLists,
please remove it, Friedrich asked us to not use it outside frameworks
and having it commented out only tempts people into using it ;)
- as with koko, it might make sense to bump the kf5 requirement to
5.79 and use clang format+hooks. there are some stilistic
inconsistency within the code already
- you should consider adding an option() definition for the
BUILD_SHARED_LIBS variable so it is documented and expicitly
initialized to a default value, I guess
- ResizeRectangle has raw pointers that aren't initialized to nullptr by default
- resizerectangle.cpp includes moc_resizerectangle.cpp is there a
reason for that? shouldn't automoc magic do this on its own?
- same for resizehandle.cpp

some typos in imagedocument.h:
  Mirrror
  horizonal (actually in mirrocommand.{h,cpp} as well)
  operattion

HS