Timer app code cleanup and improvements

[Riksu9000]

Reduced duplication.
Hide buttons instead of creating and deleting them.
Make the active area of buttons larger than what they look like. This makes the small buttons easier to press.
Fix alignment.
Small tweaks like minutes going up to 60 instead of 59.

[hubmartin]

Good work. I didn't know you can extend "clickable" area around some object. Seems like perfect fit for watches. This should be used almost everywhere in InfiniTime UI.

d7c05f8#diff-81ce0b0481912540170470032e08a92cb2353cd2dbe0acfdf49c0c19ef5191c8R32

[Riksu9000]

Good work. I didn't know you can extend "clickable" area around some object. Seems like perfect fit for watches. This should be used almost everywhere in InfiniTime UI.

d7c05f8#diff-81ce0b0481912540170470032e08a92cb2353cd2dbe0acfdf49c0c19ef5191c8R32

Usually the buttons should be made as big as possible. In this case it might look weird to have the buttons be larger than the time, so I just extended the click area instead. I think this UI could do with a redesign in the future.

[Riksu9000]

Added long press repeat. Since the button is above the number, it is hard to see, but I'd rather rework the UI separately.

VID_20210829_135003.mp4