Added a custom configuration section for the assembly. This now allows the default values of the properties of the SqlLocalDbApi class to be overridden from the application configuration file instead of needing to be explicitly set in the application code. The previous application setting (appSetting) values that could be used are now only used if the custom configuration section is not defined or if the custom configuration section is defined but the appropriate attributes are not present/set. Settings configured by the custom configuration section (system.data.sqlLocalDb) always take precedence over values from the appSettings section.
Path.GetFullPath() is now called to expand the value of the InstanceAPIPath registry key value before it is used to load the SQL LocalDB native API DLL with LoadLibrary().