Initializing vectors and matrices from scalars and ranges

A bit orthogonal to Issues ~~#253~~ and #270, it could also be possible to initialize vectors and matrices from pretty much everything (more concretely: scalars, and ranges which could be iterated) passed instead and getting rid off the constructors taking std::initializer_lists.

That way one can

initialize a 1x7 vector using 2x scalars, a 1x2 vector and a 1x3 vector passed in arbitrary order;
initialize a 1x7 vector using a 1x3 vector (padded with zeros);
initialize a 1x7 vector using a eastl::array, eastl::span, eastl::vector, std::array, std::span, std::vector, C style array (or any other custom contiguous sequence or view to that sequence) containing at most 7 elements.

Matrices can be constructed in a similar fashion by constructing the rows first using the above approach which seems the most logical imho (i.e. I see no use case for constructing a matrix from two or more smaller matrices).

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So basically this requires adding a variadic argument constructor (which may not interfere with all the remaining constructors) to the vectors, which unpacks the given arguments to tuples and concatenates those tuples to a single tuple (technically an array but it will be easier using tuples as intermediates).

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