JSON Stream and Data Types

[valbucci]

Loading JSON-formatted strings into memory and converting them to objects can lead to heavy memory allocation and EOF errors if the function is particularly large. This PR loads and deserialises the data from @@f commands incrementally, with improved error handling.

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Additional minor changes

• Some i64 data types were converted to u64 as addresses will never be negative. Instead of using -1, the default address is u64::MAX.
• Added more aliases for handling new "addr" key notation introduced in radare 6.0.0