add: some utf8 procedures:

add: some utf8 procedures:
    * get_ptr_file (WView *view, offset_type byte_index)
    * get_ptr_string (WView *view, offset_type byte_index)
    * get_ptr_growing_buffer (WView *view, offset_type byte_index)
    * get_utf (WView *view, offset_type byte_index, int *char_width)

    add: property 'utf' in the struct Wview

    Signed-off-by: Slava Zanko <slavazanko@gmail.com>
    Added temlate for splitting src/view.c into lot of
    smalest files (for better development and supporting).