Remove event observer

Sine Striker

2023-12-13 44c08f3cc456155b960ca5a115df93109d2202ce

 src/core/CMakeLists.txt

@@ -12,8 +12,6 @@
    windowagentbase.cpp
    windowitemdelegate_p.h
    windowitemdelegate.cpp
    kernel/eventobserver_p.h
    kernel/eventobserver.cpp
    kernel/nativeeventfilter_p.h
    kernel/nativeeventfilter.cpp
    contexts/abstractwindowcontext_p.h