org_time_stamp append date after cursor instead of inserting before it

[Maltimore]

I think it would be a much better default to append a date after the cursor instead of inserting it before the cursor.

[Maltimore]

I checked how emacs org-mode does this. And the answer is a bit tricky, because in emacs, the cursor positioning is different. If a line is 10 characters long, and you position the cursor to the end of the line in vim, then the cursor will be on the 10th character. In emacs, if you do the same the cursor will be on an imaginary 11th character. In nvim-orgmode, if the cursor is at the end of the line and you add a timestamp, the timestamp will be added before the last character of the line. In emacs orgmode, it will be after.

In the following, abc|d|e means that the cursor is on the d in normal mode. In vim:

* test
  test tex|t|

when you add a timestamp, this becomes

* test
  test tex<2023-01-20 Fri|>|t

In emacs the cursor will be one character further:

* test
  test text| |

when you add a timestamp, this becomes

* test
  test text<2023-01-20 Fri>| |

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Apart from that, as regards to the failing tests: the tests fail for some undocumented behavior regarding entering date ranges. IMHO, we could drop this date-range entering behavior for now, since it is undocumented and it isn't a lot of effort to enter the -- manually.

@kristijanhusak @jgollenz I'd love your input on this! If you agree, I would delete the automatic date-range entering, and delete the two tests for this.

[kristijanhusak]

I pushed a change for this. This is the summary:

1. By default, date is added after cursor if cursor is not on an existing date. For example (| | is cursor position):

* TODO Test
  Somethin|g|

Results in:

* TODO Test
  Somethin|g|<selected date>

2. If cursor is on existing date, it modifies that date
3. If cursor is on a white space after a date, it inserts a date range. For example (| | is cursor position):

* TODO Test
  <2023-01-20 Fri>| |

Results in:

* TODO Test
  <2023-01-20 Fri>--<selected date>