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Increased performance by avoiding a few unnecessary utf8-16 conversions

Use AsciiIdentifier subset to read item names

would be faster but not so Qt-ish) after comparing with protobuf (which
is only beaten by std::string appends)

Use IBind to share BindSupport<IBind,T> for common T

TWriter but could be used with QCborWriter
Simplified TextWriter
WIP: using QModelWriter to populate a QStandardModel and view it in
various ways thanks to MetaData

Improved and simplified writers not needing specific BindSupport
(contrary to DataWriter)
Replaced QBindTable with optional Val::meta(...) to support Cbor tags,
Xml attributes, and even N-dimensional structures like
QStandardModelItem that support tables, arrays and trees

Made Cbor performance close to the minimum with well-formedness
guarantees using putBigEndian similar to QDataStream and
std::vector<bool> (no malloc until deep levels)
Made QWritable costless with std::function
Made QWritable flexible with QWritable<Writer> + IWriter
Added IWriter for even simpler implementations
WIP: Added QVariant and table experiments

WIP: QBindTable

Grouped QJson* support in QJson.hpp
Kept use cases and benchmarks in main.cpp