Fixes, efficient loops, 32-bit remoting, improved logging

• FIXED A list is now passed to np.stack() instead of an iterable and Iterable is now imported from collections.abc to avoid FutureWarnings.
• FIXED Argument checksum of function fmpy.util.download_file() can now be upper case.
• FIXED Start and stop time are now passed to initialize() in FMI 1.0.
• FIXED Variadic arguments in log messages are now processed.
• NEW The model.png is now displayed on the "Model Info" page of the GUI.
• NEW 32-bit FMUs can now be simulated in a 64-bit Python environment on Windows.
  Existing 32-bit FMUs can also be retro-fitted using the function fmpy.util.add_remoting(),
  the CLI (fmpy add-remoting ...) and the GUI (Help > Add 32-bit Remoting).
• NEW The FMI headers and schema have been updated to version 2.0.1 and 3.0-alpha.3 respectively.
• NEW The function instantiate_fmu() allows the instantiation and re-use of an FMU independent of the FMI version and type to reduce CPU time.
  See examples/efficient_loops.py for an example.
• REMOVED The parameter use_source_code has been removed form simulate_fmu() (use fmpy.util.compile_platform_binary() instead)

NOTE: This release is currently not available on conda-forge because of a bug in conda-build.