[AL] Extend SerialExecutor::execute argument list.

Now it accepts and forwards an arbitrary list of arguments.
[AL] Add SerialExecutor::execute for two container.

This is used in initialization of LocalAssemblerData for every mesh element.
[AL] Add LocalAssemblerBuilder.

It is a simplified version of the VectorMatrixAssembler.
Used in creating LocalAssemblerData from mesh elements.
[AL] Pass LocalAsm to VecMatAsm in operator().

Instead of saving a local assembler reference.
This also removes the local matrix/vector types
and some types are moved to the operator().
Update SerialLinearSolver/2dDiffusionQuad test.
[T] Add comment for empty assemble()
[T] Comment out unused function arguments.
[T] Replace LocalDataInitializer with function.

A static function in the SteadyDiffusion2DExample1 class.
[T] Move LocalAsmData into SteadyDiffusionExample.
[T] Remove unused type aliases.
Merge pull request #483 from endJunction/AssemblerLib

Assembler lib
First OGS simulation main program.
[A] Remove QtXml dependency.
[A] Include copyright and version info.
[A] Make project file argument unlabeled.

This is not an optional argument and the extra flag is not necessary.
Specify arguments help info.
[T] Add EmptyProject ctest for ogs executable.
[T] Update test for ogs application.

Removing old files; Add current format project.
[A] Application reads project file in structures.

A new set of boundary conditions, fields, processes is provided.
[A] Replace local config read with ProjectData.
Added path to includes.