feat: allow omitting of dates from date ranges

[Aparaxium]

Allows the user to omit dates in date ranges using the logic:

#let daterange(start, end) = {
    if start != none and end != none [
        #start #sym.dash.en #end
    ]
    if start == none and end != none [
        #end
    ]
    if start != none and end == none [
        #start #sym.dash.en Present
    ]
}

[jskherman]

Hi @Aparaxium, can you give some example cases where omitting dates (both dates and just one of the dates) in places that have date ranges would be valuable? So far, a valid case has been brought to attention in issue #10 where someone would need to hide their length of stay in an educational institution.

For the use case of having the end date of "present", it can just be included in the YAML file as a value as mentioned in issue #4.

[Aparaxium]

Hello,

Initially I had intended to remove the dates from the projects fields because I found it difficult to remember when I started on many of them. I then extrapolated this to every date range field.

I understand if this is something you don't want to include or want the implementation details to be changed, however i took care to try to make sure it would handle every case and it remains optional for the user.

Here are some other reasons to exclude dates:

• Employers can guess at the age of an employee
• Gaps in employment can disqualify good candidates from getting their foot in the door, which can apply to people transitioning careers

[Aparaxium]

Hello,

I just realized that the json schema needs to be updated to facilitate this.

[jskherman]

I see, thanks for expanding. The context for me is a lot clearer now.

On a side note, over the implementation, I've looked over the utils.daterange() and all seems good to merge (now to just solve the merge conflict...). Thank you for also updating the JSON schema.

Let me know if it is all good for merging :>