771 add besmod export

[HvanderStok]

Closes #733, #746 and #771.
Needs new BESMod version 0.6.0 RWTH-EBC/BESMod#101 and the used AixLib version is increased to 2.1.1.

Additionally, the use_conditions parameter infitration_rate is renamed to base_infiltration, as it was already named in the documentation and the parameter static_infiltration is added which is now used for the static heat load calculation with a value of 0.5.

[FWuellhorst]

The feature looks really good, thanks for the hard work. I will test it locally, but I expect only these comments. Address them as you see fit. Only aspect would be backwards compatibility with base_infiltration, which we could quickly discuss with @DaJansenGit

[FWuellhorst]

@HvanderStok Aside from the mentioned comments, this feature looks really cool. I still found some infiltration_rate cases e.g. in test_data.py, is this intended? Aside from that, incorporating the features in my branch worked like a charm. Great work!

One "issue" was that I had an extended version of TEASERThermalZone in my own code. However, the feature of this custom model is nice for others, as well, so I added it in BESMod. If users require this, they could just override the template file if they find it annoying or use own modifiers.

[HvanderStok]

@HvanderStok Aside from the mentioned comments, this feature looks really cool. I still found some infiltration_rate cases e.g. in test_data.py, is this intended?
@FWuellhorst
infltration_rate was before directly an attribute in the ThermalZone class and was deprecated. It appears that it was not removed in these tests and also in one example. Should I refactor these and remove it finally from the ThermalZone class? The deprecation warning was stated five years ago.