Rework evaluation to use shared pointers, fix bugs

src/Parser/Parser.cpp

@@ -1,4 +1,5 @@
 
+#include <algorithm>
 #include "Parser.hpp"
 #include "ParsedStatements/ParsedStatement.hpp"
 #include "UnaryOperatorKind.hpp"
@@ -65,7 +66,7 @@ ParsedStatement *Parser::ParseAssignment(IToken *current) {
     return new ParsedAssignmentStatement(isLocal, ((IdentifierToken*)identifier) -> Value, expression, start, expression->GetEndPosition() - start);
 }
 
-ParsedStatement *Parser::ParseBlock(vector<TokenKind> endTokens) {
+ParsedStatement *Parser::ParseBlock(const vector<TokenKind>& endTokens) {
     vector<ParsedStatement*> statements;
     while (true){
         auto next = this -> Next();