Clear symbol tables when leaving blocks

src/language/PugsParser.cpp

src/language/node_processor/ASTNodeListProcessor.hpp

src/language/node_processor/DoWhileProcessor.hpp

src/language/node_processor/ForProcessor.hpp

src/language/node_processor/IfProcessor.hpp

src/language/node_processor/WhileProcessor.hpp

src/language/utils/SymbolTable.hpp

src/mesh/SynchronizerManager.cpp

src/mesh/SynchronizerManager.hpp