Qtgql

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This release fixes a bug where object that implements
node but is on a union or on an interface that doesn't implement node.

Contributed by [ניר](https://github.com/nrbnlulu) via [PR #312](https://github.com/qtgql/qtgql/pull/312/)

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This release adds initial support for fragments.
- [x] Fragments on object types.
- [x] Fragments on interfaces.
- [x] Nested fragments
- [x] Fragments with variables usages.

Fragments are invisible user-wise. This means that they have no
runtime type, we are just unwrapping them in the operation evaluation phase.

Contributed by [ניר](https://github.com/nrbnlulu) via [PR #311](https://github.com/qtgql/qtgql/pull/311/)

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This release adds support for list of interfaces.

Contributed by [ניר](https://github.com/nrbnlulu) via [PR #305](https://github.com/qtgql/qtgql/pull/305/)

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This release adds support for list if unions.

Contributed by [ניר](https://github.com/nrbnlulu) via [PR #303](https://github.com/qtgql/qtgql/pull/303/)

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Features
- Support "non-node" objects on lists.

Refactor
- When updating a proxy object field, instead of deleting it and creating a new one,
replace it with the new concrete and emit only the signals that are needed.

Bug fixed
- Arguments not supported on scalar types.

Contributed by [ניר](https://github.com/nrbnlulu) via [PR #302](https://github.com/qtgql/qtgql/pull/302/)

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Initial support for unions.
currently unions are represented as a `ObjectType *`
and user would need to cast it based on the `__typeName()` property.

Contributed by [ניר](https://github.com/nrbnlulu) via [PR #299](https://github.com/qtgql/qtgql/pull/299/)