alpha.7 - CLI UI support (almost), better arg handling

alpha.7 includes two main features:

Better arg handling

Previously, passing an argument such as --win nsis zip (any argument with an array value), the command would fail. Now, it works!

UI Support

The cli-ui is supported in this plugin, but won't be available until the rc.4 release of vue-cli. Here is what's included:

• dashboard and analyzer support
• config for build command arguments:
  • choose target architectures
  • choose which platforms to build for, and which formats for each target
• logo, better discoverability