Some error nits#3682
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The first character on a line is taken to be at position 1 by other compilers and IDEs, make it so for F* too.
This prints errors like
```
* Error 189 at X.fst:3.13-3.16:
- Expected expression of type Prims.int
got expression 'a'
of type FStar.Char.char
```
Where X.fst:
```
module X
let x = 1 + 'a'
```
Clicking on the error location in VS code highlights over the `'a'`.
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This makes F* print errors like
Where X.fst:
Clicking on the error location in VS code highlights over the
'a'. It requires offsetting the column in source positions by 1, to make them 1-based instead of 0-based, as I think other tools do.Marking as a draft since it requires patches to interactive modes to deal with the offset (or as an alternative we could just change the show instance of range to add a +1 there). This also removes the bold style in errors and warnings.