Fixing a bug where the hinted pin size for a core string was short by 1 because the null-terminator was not included in the calculated size.
Merge pull request #192 from jmlvanre/core-str-pin-size-fix

Atom Core string pin fix
Adding an IsVoid function to Atom::TCore
1. Throwing an error when trying to de-reference a key that does not exist (when it's not being read as an optional of that type)
2. Using IsVoid to reduce the instruction count when reading from the database as an optional.
base/json now correctly decodes strings containing backslash-u sequences.
Merge pull request #195 from JasonL9000/json-ucode

base/json now correctly decodes strings containing backslash-u sequences
Merge pull request #194 from jmlvanre/deref-non-key

Throw when de-referencing a key that does not exist