Rename view_info.{win,win_size}

Also add a comment for it.
Reduce code duplication in view.c

Achieve this by extracting four function with duplicated code.
Extract load_view_data() from enter_view_mode()

Loads list of strings and related data into view_info_t structure
from specified file.
Make R key of view mode reload data of the view

Thanks to Robert Sarkozi.
Document new meaning of the R key in view mode
Merge branch 'add-key-to-reload-file-view'

Change meaning of the R key in view mode from redrawing view to
reloading it preserving scroll position.

Thanks to Robert Sarkozi.