Fix signedness warning with older GCC versions
[clang-analyzer] Remove unused write
[clang-analyzer] Fix malloc(0) warning
[cppcheck] Remove EERIE_ANIMMANAGER_ReloadAll()

Was unused.
[cppcheck] Remove unused UnselectAllNodes()
[cppcheck] Remove unused UnLinkNodeFromNode()
[cppcheck] Remove unused TranslateSelectedNodes()
[cppcheck] Remove unused SpecialFade{,R}()
[cppcheck] Remove unused SetWidth()
[cppcheck] Remove unused SelectNode()
[cppcheck] Remove unused SaveIOScript()
[cppcheck] Remove unused RestoreAllIOInitPos()
[cppcheck] Remove unused ReloadAllScripts()
[cppcheck] Remove unused RecalcLightZone()
[cppcheck] Remove unused MouseInCam()
[cppcheck] Remove unused MakeNodeName()
[cppcheck] Remove unused LinkNodeToNode()
[cppcheck] Remove unused IsInGroup()
[cppcheck] Remove unused GroundSnapSelectedIO()
[cppcheck] Remove unused SnapShot::GetSnapShotDim