Fixed broken model instantiated from Qml

[filcuc]

This was due by multiple factors. The most important is that we always registered Models as DosQAbstractItemModelWrappers that is a subclass of QAbstractItemModel. This in turn broke the APIs when the user really instantiated a QAbstractTableModel from the binded language because the cast from DosQAsbstratItemModelWrapper to QAbstractTableModel failed.
The solution is to add different correct subclasses during registration

[codecov-commenter]

Codecov Report

Merging #102 (4773a8a) into master (a33d839) will increase coverage by 1.77%.
The diff coverage is 11.00%.

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
+ Coverage   69.35%   71.12%   +1.77%     
==========================================
  Files          20       20              
  Lines        1749     1711      -38     
==========================================
+ Hits         1213     1217       +4     
+ Misses        536      494      -42     

Impacted Files	Coverage Δ
...ib/include/DOtherSide/DosIQAbstractItemModelImpl.h	100.00% <ø> (ø)
.../include/DOtherSide/DosQAbstractItemModelWrapper.h	0.00% <0.00%> (ø)
lib/src/DosQAbstractItemModel.cpp	44.31% <ø> (+11.26%)	⬆️
lib/src/DosQMetaObject.cpp	75.23% <0.00%> (ø)
lib/src/DosQQuickImageProvider.cpp	0.00% <0.00%> (ø)
lib/src/DOtherSide.cpp	55.95% <3.84%> (+0.99%)	⬆️
lib/src/DosQDeclarative.cpp	69.56% <57.14%> (-10.44%)	⬇️
lib/include/DOtherSide/DosQObjectWrapper.h	93.54% <100.00%> (ø)

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