Aer/TODO

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TODO list for typehinting branch.
Below list contains things that should be changed/fixed/implemented.
1. int[] $arr = {5, 5};
This syntax is unsupported yet. Should replace the array() function.
2. Class properties do not support strict data type hinting.
3. Methods declaration / definition still uses function keyword.
4. PH7_OP_DONE operator should check if return value match the data type of declared method/closure.
5. Some builtin functions like isset() seems to be useless, if varaible is not defined, interpreter will throw an error.
6. Interpreter should verify that Program::main() returns a value of int or void data type.