main: Fix default swipe seek length

It's supposed to be the same as the keyboard arrows.
backend: Fix direction of swipe with RTL languages
main: Simplify checking for "recent" sources
main: Coding style fixes
main: Add local bookmarks to the recent view
main: Remove unused totem_interface_get_license()
main: Move header button creation helper to -interface.[ch]
main: Remove unused "new-clicked" signal
main: Add "current-page" property
main: Move Open/Add menu items to Add button
main: Unmark strings as translatable

As those aren't user-visible anymore.
all: Ellipsis changes

Changes "..." to "…"
main: Request source to start monitoring

Some of them didn't send us notifications if we didn't request them
explicitely.
main: Remove "Add directory" option
main: Add a way to insert new items in the recent view

By adding them to the bookmarks source.
main: Add to the view instead of playing directly

The 'Add' button will now add new items to the Recent view
instead of simply playing the files.
main: Remove trailing linefeed