Remove multiple nim versions at once
## Feature request
Would it be possible to remove multiple nim versions at once - with the remove command ?
Ex:
```
> choosenim show
1.2.10
1.4.12
1.6.8
1.6.10
1.6.12
> choosenim remove 1.6.10 1.6.8 1.4.12 1.2.10
> choosenim show
1.6.12
```
or:
```
> choosenim show
1.2.10
1.4.12
1.6.8
1.6.10
1.6.12
> choosenim remove all except 1.6.12
> choosenim show
1.6.12
```
and even:
```
> choosenim show
1.6.8
1.6.10
1.6.12
> choosenim remove 1.6.[10, 8]
> choosenim show
1.6.12
```
### Internal Algorithm
Would this need to check that there is still at least one nim version?
