Missing support for bool consts in Tolk (0.8)

[Skydev0h]

It is not possible to define a bool const, it is automatically created as int const.

This causes issues when passing as a bool parameter or when passing to storeBool.

Such constants can be used to make code more self explanatory and easier to understand, for example:

...

const ONLY_NECESSARY = true;
const ALL_DATA = false;

...

fun loadData(onlyNecessary: bool) {
...
    if (onlyNecessary) {
        return;
    }
...
}

...

fun onInternalMessage(myBalance: int, msgValue: int, msgFull: cell, msgBody: slice) {
...
    loadData(ALL_DATA);
...
}

fun onExternalMessage(inMsg: slice) {
...
    loadData(ONLY_NECESSARY);
...
}