Select region on the Options Panel in the Sequence View

A common region selection mechanism should be developed for the Options Panel in the Sequence View.

Maybe, it should always be shown on the Options Panel (not on a tab).
It should listen at least to the following changes in the context: selection of another sequence (in multi-sequence view), modification of a sequence, etc.

It should have values:

1. Whole sequence
2. Selected
3. Custom

Also, the program should remember regions selected by a user: when a user has selected a region for a sequence, selected another sequence and selected the first sequence, the correct region should be shown for the first sequence.

This widget may also include selection of the strand (Both/Direct/Reverse-complement) and sequence/translation for nucleotide sequences.

This mechanism should be used on the "Information" and "Search in Sequence" tabs of the Options Panel.