treewide: rework internal data type system

Instead of relying on json_object values internally, use custom types to
represent the different ucode value types which brings a number of
advantages compared to the previous approach:

 - Due to the use of tagged pointers, small integer, string and bool
   values can be stored directly in the pointer addresses, vastly
   reducing required heap memory

 - Ability to create circular data structures such as
   `let o; o = { test: o };`

 - Ability to register custom `tostring()` function through prototypes

 - Initial mark/sweep GC implementation to tear down circular object
   graphs on VM deinit

The change also paves the way for possible future extensions such as
constant variables and meta methods for custom ressource types.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

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