Update for AssemblerLib::MeshComponentMap.
Prepare SerialVectorMatrixBuilder for AssemblerLib.
SerialVectorMatrixBuilder: Remove default VectorType_ template arg.
Split SerialVectorMatrixBuilder into Dense and Lis variants.
Move SerialVectorMatrixBuilder into AssemblerLib.
Correct global assembler operator() constness.
Extract AssemblerLib::SerialExecutor from vector/matrix builder.

Both are independent of each other.
Remove element type from serialExecute. Add iterator version.
Invert argument order in serialExecute().