Brian Alexander Robertson, a.k.a. B.A. Robertson, has just about done it all in a career spanning five decades.  The Scottish-born talent has written an international best-selling, Ivor Novello Award-winning hit (“The Living Years” for Mike + The Mechanics), scored hit singles under his own name (“Bang Bang,” “Knocked It Off”), written with Burt Bacharach and Cliff Richard, and reinvented classic Disney songs with artists ranging from Billy Joel to LL Cool J.  Last year, Cherry Red brought Robertson’s three 1980-1982 solo albums for the Asylum label back into print on CD in…