Kimai2: duration input should be more flexible about values entered

[heeen]

Is your feature request related to a problem? Please describe.
compared to an excel spreadsheet that tracks time durations, the following should work:

1:00 -> 01:00
1 -> 01:00
:30 -> 00:30

Describe the solution you'd like
don't make me type a leading 0 for no good reason

Describe alternatives you've considered
quick buttons for repeating values like 1hr meetings

Additional context
Add any other context or screenshots about the feature request here.

[2chg]

Additionally I would like to input durations as decimals:
(consider dot and comma equally as decimal point for easy i8n)

1 ⇒ 01:00
1,5 ⇒ 01:30
1.5 ⇒ 01:30
0,5 ⇒ 00:30
5.25 ⇒ 05:15

and optionally without leading zero
,5 ⇒ 00:30

[2chg]

Idea: Maybe some simple JavaScript, that simply clarifies/calculates the correct duration format.

(Pseudocode!)

if (/^\s*(\d*)([.,](\d*))?\s*$/) {
    duration = sprintf(parsInt('0' + $1), '%2d') + ':' + sprintf(parsFloat('0.' + $2)*60, '%2d')
}

[kevinpapst]

A lot of changes/improvements has been applied to the handling of the duration field, please see #2264

You can test it at https://demo-branch.kimai.org (eg. with susan_super and kitten).

[2chg]

Thank you very much. A great improvement in my opinion.