Support XDG Base Directory Specfication

[muradm]

🚀 Feature request

- [ ] new
- [ ] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ X ] config
- [ ] help
- [ ] version
- [ ] doc

Description

There is a XDG Base Directory Specification which supports keeping home directory in linux environments tidy. Currently, @angular/cli keeps its global configuration in $HOME/.angular-config.json which is poluting user's home directory. According to mentioned above specification, it is advised to keep configuration under $HOME/.config directory by default.

Describe the solution you'd like

Non intrusive solution is provided with #16034 PR. Basically it makes everything working as it is now, until user decides to move current $HOME/.angular-config.json to $XDG_CONFIG_HOME/angular/.angular-config.json. Then @angular/cli will continue using .angular-config.json from new location. Where $XDG_CONFIG_HOME as per specification: if provided in the environment new location will be $XDG_CONFIG_HOME/angular/.angular-config.json other wise $HOME/.config/angular/.angular-config.json. This way it does not break other non XDG users like people under Windows.

Describe alternatives you've considered

No alternatives.

[clydin]

Closing as #16034 appears to have been merged.

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