Merge Assert, StaticAssert, ThrowException into Core

Recently Core grew with additional dependencies on StaticAssert (in 1.76) and ThrowException (in the next release), previously it was only depending on Assert and Config. That made a lot of libraries checkout the same four repositories, three of them containing only a few headers. Merging into a single dependency will affect mostly positive about 100 libraries and negative 1: StlInterfaces (depends on Assert, and will on Core).

There is some difference in documentation format used (https://github.com/boostorg/core/commit/95924b1329da49e70c9c8485b87e066895db2d64#r58137316), but that should be solvable.

Headers list:

StaticAssert (depends on Config)
- boost/static_assert.hpp

Assert (depends on Config)
- boost/assert.hpp
- boost/current_function.hpp
- boost/assert/source_location.hpp

ThrowException (depends on Assert and Config)
- boost/throw_exception.hpp
- boost/exception/exception.hpp