The main motivation behind this is simplicity and correctnes, but the new small config library is also faster:
```
BenchmarkDefaultConfigProvider/Viper-16 252418 4546 ns/op 2720 B/op 30 allocs/op
BenchmarkDefaultConfigProvider/Custom-16 450756 2651 ns/op 1008 B/op 6 allocs/op
```
Fixes#8633Fixes#8618Fixes#8630
Updates #8591Closes#6680Closes#5192
Added a Vimeo EnableDNT privacy option to the Hugo config. This will enable the Vimeo 'Do Not Track' flag when either Vimeo shortcode tempalte options are used. When enabled, it will force the Vimeo player to be blocked from tracking any session data, including all cookies and stats.
Fixes#7700
The current full set of options for GA is now:
```toml
[privacy]
[privacy.googleAnalytics]
disable = false
respectDoNotTrack = true
anonymizeIP = true
useSessionStorage = true
```
Fixes#4775
