revert integer literal suffixing again and instead generate C hex literals if no suffix is used to make the C compiler consider unsigned types for their values (see C standard 6.4.4)

- append U-suffix only on coercion when the target type is unsigned
- append L/LL-suffix when value looks too large for a smaller constant value type

fix bytes literal creation from compile-time DEF expressions (used to become Unicode strings due to missing encoding)

This avoids the issue with overloaded address-of operators.

seems like the explicit deepcopy helpers in the control flow state objects are no longer needed but crash the compiler due to infinite recursion

fix crash where Coroutine deallocation could execute Python code to print a warning which could trigger GC and hit the dead Coroutine object

exclude optimised builtin methods from being the Python method call optimisation (previously broke code generation)