Handle missing /target argument for build command.
#342
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Ran into this myself today, if a user fails to provide the
/targetargument when runningelectronize buildthey simply get aKeyNotFoundException.This change checks for the presence of this argument and, if not present, displays help information to the user as well as gracefully exiting.
Related to #296
As a sidenote, is there a reason we don't use a command line parsing library (for example - https://github.com/commandlineparser/commandline) to handle these cases for us?