feat(@angular/cli): Support XDG Base Directory Specfication
feat(@angular/cli): Support XDG Base Directory Specfication

Explained here: https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html

Current change affects reading of global config from `.angular-config.json`. By default it will be created in user's home directory. If user moves it manually to `$HOME/.config/angular/.angular-config.json`, it will be subsequently read from new location.
manekinekko/angular-cli,clydin/angular-cli,clydin/angular-cli,beeman/angular-cli,filipesilva/angular-cli,Brocco/angular-cli,Brocco/angular-cli,hansl/angular-cli,catull/angular-cli,catull/angular-cli,manekinekko/angular-cli,hansl/angular-cli,catull/angular-cli,DevIntent/angular-cli,beeman/angular-cli,angular/angular-cli,angular/angular-cli,filipesilva/angular-cli,Brocco/angular-cli,ocombe/angular-cli,clydin/angular-cli,DevIntent/angular-cli,angular/angular-cli,DevIntent/angular-cli,hansl/angular-cli,ocombe/angular-cli,DevIntent/angular-cli,ocombe/angular-cli,clydin/angular-cli,DevIntent/angular-cli,geofffilippi/angular-cli,Brocco/angular-cli,geofffilippi/angular-cli,beeman/angular-cli,hansl/angular-cli,beeman/angular-cli,filipesilva/angular-cli,Brocco/angular-cli,angular/angular-cli,geofffilippi/angular-cli,ocombe/angular-cli,manekinekko/angular-cli,filipesilva/angular-cli,catull/angular-cli,ocombe/angular-cli,geofffilippi/angular-cli