Generated code issues - first round

[Tamás Koczka]

• Go: non-primitive fields should be pointer types
• Java: one public class per file
• Java: fix fast compilation's loading issue
• Java: import java.util.ArrayList & import java.util.Arrays
• Java / Generic: use converted type: Onearray arr -> ArrayList<Integer>
• Java: arr[i] -> arr.get(i)
• Perl: arrays should be prefixed with @ and not $
• Swift: set field type
• Swift: find out how to handle optional values
• Swift: non-mutated fields should be let and not var (or disable warning?)
• Swift: i++ -> i += 1
• Swift: remove semicolons (;)?
• TS/JS: non-mutated fields should be const and not let (low prio)
• C++: non-primitive fields should be pointer types
• C++: auto arr = std::make_shared<std::vector<int>>(std::vector<int>({ 1, 2 }));
• C++: item access: (*arr)[i]
• Fix double semicolon (;) issues
• Perl, Python, Ruby: convert comments to #-type ones