[FEATURE] Do not track time under a specified amount

[vivienhennig]

If the start/enter button is hit by mistake and is stopped a few seconds after that happened the time is tracked and needs to be deleted manually. As well when editing that entry there is always an error which says, that start time and end time need to be in different minutes.

How to solve:

• ask if the short time period should be tracked if its under e.g. 1 minute
• add settings where a time can be specified, which defines which time spans should not be tracked