[librender] use static_cast instead of dynamic_cast when the conversion is guaranteed

...adiumNBR/NodeGraph/PremadeNodes/AntiAliasing/FXAANode.cpp

...NBR/NodeGraph/PremadeNodes/Compositing/DifferenceNode.cpp

...eGraph/PremadeNodes/Compositing/LessThanThresholdNode.cpp

.../RadiumNBR/NodeGraph/PremadeNodes/Compositing/MaxNode.cpp

.../RadiumNBR/NodeGraph/PremadeNodes/Compositing/MinNode.cpp

...eGraph/PremadeNodes/Compositing/MoreThanThresholdNode.cpp

...umNBR/NodeGraph/PremadeNodes/Compositing/MultiplyNode.cpp

...umNBR/NodeGraph/PremadeNodes/Compositing/OneMinusNode.cpp

.../RadiumNBR/NodeGraph/PremadeNodes/Compositing/SumNode.cpp

...r/RadiumNBR/NodeGraph/PremadeNodes/Filters/FilterNode.hpp

...NBR/NodeGraph/PremadeNodes/Filters/FilterROByTypeNode.hpp

...aph/PremadeNodes/RenderPasses/AccessibilityBufferNode.cpp

...aph/PremadeNodes/RenderPasses/AccessibilityBufferNode.hpp

...BR/NodeGraph/PremadeNodes/RenderPasses/ClearColorNode.cpp

...BR/NodeGraph/PremadeNodes/RenderPasses/EmissivityNode.cpp

...mNBR/NodeGraph/PremadeNodes/RenderPasses/EnvLightNode.cpp

...BR/NodeGraph/PremadeNodes/RenderPasses/LocalLightNode.cpp

...iumNBR/NodeGraph/PremadeNodes/RenderPasses/SimpleNode.cpp

.../NodeGraph/PremadeNodes/RenderPasses/TransparencyNode.cpp

.../RadiumNBR/NodeGraph/PremadeNodes/RenderPasses/UINode.cpp