X690

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* This fixes the incorrectly provided extra ``rest`` in the dependency
metadata. This extra has become obsolete and removing it fixed
versioning errors when installing ``x690``.

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* Renamed ``x690.types.Type`` to ``x690.types.X690Type``
* Flagged as "stable"
* Dropped support for Python 3.6

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* Flagged as "production" release
* All changes from 0.5.0-alpha.0 - 0.5.0-alpha.6

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* Relaxed dev-dependencies a bit which caused issues in some installations

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* Allow ObjectIdentifier instances to be created for "relative" sub-trees by
delaying the byte-conversion.

When converting ObjectIdentifiers to bytes, the first two objects are
"folded" together. This is not possible for some values. Delaying this
folding until the "is-needed" moment allows the use for such OIDs to be used
for subtree modifications/concatenation. They will still raise errors if
they are converted to bytes unmodified.

* Internal typing improvment

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* Raise an exception when trying to decode data that is out-of-bounds of the
processed blob.
* Accessing a scalar index (not a slice) from an OID returns the integer value.