Adds ability to answer call with hardware HOME button

preparation to winter time

Change-Id: I0d22a6fbb92a61f08b50cae5c14d0030b81ee6ec
Remove 'Allow custom buttons' checkbox (2/2)

Let hardware buttons be rebound by default.

Change-Id: If19fb357cf9dcea419bea6242f4fc1f388916e4d
Fix LTO availability check.

Change-Id: Ifb8ab65584df2f8b638b6e178e134b5e3a61cfce