Validate plugin @Alias, @Command, and @Option names to ensure no duplicates occur

Should be invalid for same resource scopes
@Alias("whee")
@Alias("whee")

Should be invalid in same command:
@Option(name="named")
@Option(name="named")

And so on...

Or, it should be possible to reference by Fully Qualified Name if this situation does arise (for @Alias.)