Metamodeling framework, Spawn data generator, reset function

[ThibaultMarzullo]

This PR includes:

• the new Spawn data extraction utility found in spawn-tools. It generates files for the Spawn FMU, later used by BOPTEST for forecasts and KPIs. The data is extracted from the epw and idf files used in the Spawn model.
• the new metamodeling framework. This new version will run Spawn and collect model data, then identify a state-space model using N4SID. Implements best subset selection and forward step-wise selection. All the matrices are then saved where the MPC can find them.
• a new reset function for the ACTB client, and helper functions
• MPC (non-DR) example update: changed the TVP sources and minor cleanup
• RBC (non-DR) update with the new stop() function
• repo cleanup, all Spawn resources now go to testcases\SpawnResources\<testcase name>. This includes Spawn data to be included in FMUs, metamodels, etc.

[ThibaultMarzullo]

It looks like there is a conflict due to the tick labels in the MPC example. I did not pull that commit before doing the changes. Can we resolve this without undoing all the changes I made in the new commit?

[nllong]

These changes look great. I didn't go through them 1-by-1, but they worked as expected on my computer.

[nllong]

@ThibaultMarzullo -- you'll need to resolve the conflicts before merging...

[ThibaultMarzullo]

Thanks Nick, it has to do with the MPC plot ticks, I'll fix that.