Fix some CppCheck errors

Fix some CppCheck errors

dali/internal/update/gestures/scene-graph-pan-gesture.h	138	operatorEqVarError
dali/integration-api/events/key-event-integ.cpp	42	passedByValue
dali/internal/event/actors/actor-impl.cpp	4867	redundantCopyLocalConst
dali/internal/event/animation/linear-constrainer-impl.h	113	arrayIndexThenCheck
dali/internal/event/events/key-event-processor.cpp	53	redundantAssignment
dali/internal/event/actors/actor-impl.h	1872	passedByValue
dali/internal/render/common/render-algorithms.cpp	203	duplicateBreak
dali/public-api/math/quaternion.cpp	54	useInitializationList

Change-Id: Ifa3b1cd65187d0e0c00f81368ba90a2988975739