v0.10.0 release

Changed

• GCC7 and GCC8 artifact builds have been removed, and GCC9 artifact builds added. This is currently the only supported GCC version.
• The file observer is now programmatically configurable, and there is no longer a need for clients to create a separate LogConfig.xml file upfront to specify it's configuration.
• The file observer no longer outputs headers as variable name [reference, type, causality]. Instead only the variable name is output, and the extra data about each variable and the model itself is output in a separate metadata file, in YAML format. This will have the same filename as the CSV file with the simulation data, including the timestamp, with _metadata at the end.
• Using find_variable no longer throws an exception, but rather returns an optional value, which may be empty if the variable could not be found.
• Update to proxyfmu 0.2.9.

Added

• An asynchronous version of simulate_until is now available through the execution interface. This accepts
  an optional end time parameter and launches the execution in a new thread.
• Support has been added for optionally specifying simulation end time (where only start time was supported) in OspSystemStructure.xml. If specified, end time will also be parsed and made available in the simulation configuration.

Fixed