Enforce more modern Qt/KF code

GIT_SILENT

CMakeLists.txt

@@ -42,6 +42,12 @@ ecm_setup_version(${libkmahjongg_VERSION}
 
 add_definitions(-DTRANSLATION_DOMAIN="libkmahjongg5")
 
+add_definitions(
+    -DQT_NO_KEYWORDS
+    -DQT_STRICT_ITERATORS
+    -DQT_DISABLE_DEPRECATED_BEFORE=0x050900
+    -DKF_DISABLE_DEPRECATED_BEFORE_AND_AT=0x052E00
+)
 if (${KF5Config_VERSION} STRGREATER "5.56.0")
         add_definitions(-DQT_NO_FOREACH)
         MESSAGE(STATUS "compile without foreach")