Script interface Backend Replacement

[fweik]

Description of changes

• Rename all the things
• Make Variant (shared) own contained objects
• Introduce separate packing format for sending objects via MPI/serializing
• Make manager and context concepts explicit
• Moved script interface unit tests into script interface
• Added more tests
• Removed unused Utils::make_function
• Remvoed unused constructors of ScriptInterface::AutoParameter

[codecov]

Codecov Report

Merging #3794 into python will increase coverage by 0%.
The diff coverage is 95%.

@@           Coverage Diff           @@
##           python   #3794    +/-   ##
=======================================
  Coverage      89%     89%            
=======================================
  Files         554     560     +6     
  Lines       24166   24023   -143     
=======================================
- Hits        21566   21457   -109     
+ Misses       2600    2566    -34     

Impacted Files	Coverage Δ
src/core/io/writer/h5md_specification.cpp	100% <ø> (ø)
src/core/thermostat.hpp	90% <ø> (ø)
src/script_interface/ComFixed.hpp	100% <ø> (ø)
src/script_interface/tests/None_test.cpp	50% <ø> (ø)
src/script_interface/tests/Variant_test.cpp	100% <ø> (ø)
src/script_interface/tests/get_value_test.cpp	100% <ø> (ø)
...tils/include/utils/serialization/unordered_map.hpp	42% <ø> (-58%)	⬇️
src/script_interface/get_value.hpp	87% <66%> (-1%)	⬇️
src/script_interface/shapes/Union.hpp	80% <66%> (ø)
src/script_interface/tests/Exception_test.cpp	66% <66%> (ø)
... and 93 more

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[fweik]

@jngrad I don't understand the sphinx error, can you help me out?

[RudolfWeeber]

Didn't read everything, yet.

[fweik]

I'd really appreciate it if I could get some feedback on the design.

[RudolfWeeber]

I’m not totally clear about the role of ObjectManager yet. Is its purpose to hide the concept of contexts from the client? Why is there serialization code in the object manager. Is that just to save the creation policy along with the state of the object?

[fweik]

When restoring from serialization, a context is needed to create the objects in, this is why it is on the contex. Now that you mention it, maybe it would be better as a free function, let me try.

The ObjectManager (which is in dire need of a better name) is to deal with the multiple contexts that exist, which is needed e.g. for serialization, because for every object, it needs to be stored in which kind of context it belongs.

[fweik]

I've added some docs and move the serialization code to ObjectHandle

[jngrad]

ok from my side

[fweik]

Thank you for adding the docs ;-)

Docstrings have been added.