External storage accesses #565
Description
External storage accesses will work in the upcoming Leo version. For example, if program child.aleo contains a storage variable x: u32, then another program parent.aleo is able to read from x using the syntax child.aleo/a. Same goes for vectors. Note that writing to an external storage variable of any type is not allowed. So the access is read-only (which is already the case for mappings.... I'm not sure if external mapping reads are documented but if they're not, they should too).