Provide GDB pretty-printing support for matrix and vector classes

[Mikhail Katliar]

It is convenient to be able to print Blaze matrices and vectors from a debugger.

[Mikhail Katliar]

I have implemented pretty-printing of StaticMatrix and DynamicMatrix in this pull request: https://bitbucket.org/blaze-lib/blaze/pull-requests/39

Example:

StaticMatrix<double, 2, 3, rowMajor> X1 {
    {1., 2., 3.},
    {4., 5., 6.}
};

gdb:

p X1
$1 = StaticMatrix<double, 2, 3, rowMajor> (data ptr: 0x7fffffffcca0) = {[0,0] = 1, [0,1] = 2, [0,2] = 3, [1,0] = 4, [1,1] = 5, [1,2] = 6}

Also displayed nicely in VS Code:

‌

[Mikhail Katliar]

Implemented pretty printing for all dense and compressed vector and matrix classes.

[Klaus Iglberger]

The feature has been provided by pull request #37. It is immediately available via cloning the Blaze repository and will be officially released in Blaze 3.7.