Make the authentication flag (-a) optional

[MatthewKosloski]

If it exists, authentication arguments are read from App.config, and these serve as the default and can be optionally overridden by args supplied to the CLI. In other words, if there is a complete App.config, no authentication arguments need to be provided to the CLI under the -a flag.

However the -a flag is still required with blank CLI args (-a ::::).

Thus, to indicate an intention to use the authentication arguments from App.config, you can do:

dotnet SFDCInjector.dll inject -a :::: -e EventClassName:EventFieldPropertyValue

To improve user experience, I propose that the -a flag should be optional and only included if there is an intention to override one or more authentication arguments from App.config.

In other words, I propose that aforementioned usage of the injector be simplified to:

dotnet SFDCInjector.dll inject -e EventClassName:EventFieldPropertyValue