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Qwt finder rename to QWT

See merge request !192

Fix issue OpenFlipper-Free#176, Qt UIC include directories.

Closes OpenFlipper-Free#176

See merge request !190

Single configuration generators on Windows (e.g. nmake) didn't get the
correct include path for autogenerated headers from .ui files.

Multi-configuration generators (e.g. MSVC) only worked in an incomplete
subset of build types.

While AUTOUIC automatically sets include directories for the target,
these only seem to be PRIVATE include dirs, leading to failure when
trying to use them from other projects than where the .ui file lives.

Bugfix: Colored edge rendering in core profile

Closes OpenFlipper-Free#167

See merge request !188

Improve incremental compile time with explicit template instantiation.

See merge request !187

This is a minimally invasive change, leaving the old code intact, as it
is shared with the other renderers.

Instead of creating render objects as it should, the previous
implementation called glDraw itself and used host-memory ("sysmem")
buffers for it, which are not supported in core OpenGL.

In the new implementation, edge coordinates and colors are uploaded to
a common VBO and rendered using proper render objects.

Having two VBOs for coordinates and colors respectively is advantageous
for better performance when rendering non-colored edges and could be
achieved by packing both in a VAO, which this implementation does not
yet do. However it's better to have something working than to have something
more efficient but broken.

NB Colored edge rendering in classic renderer was also(!) broken before and
is not fixed by this commit, crashes can be provoked by setting edge
colors, switching the drawmode to colored edges and emitting an
updatedObject with the UPDATE_COLORS flag.

I have not run any tests, but I suspect the colored halfedge drawmode to
be similarly broken. A big refactoring / rewrite might be a good idea.

By not including the *T_impl.hh files in the corresponding *T.hh files,
but only providing explicit template declarations and instantiations for
the types we use them for, we can avoid recompilation of code that
(indirectly) depends on the *T.hh files, which turn out to be many.

This still leaves a lot of re-linking with libACG, but at least it's
much faster than before.

Cleanup

See merge request !186

Fix warnings qt

See merge request !185