When Buffalo Bills founder Ralph C. Wilson died in 2014, he left behind a commitment in his will to improve life in Western New York and the money to help make it happen. To the stunned delight of more than a dozen arts and cultural institutions, that promise is about to become reality for them and their patrons. The Ralph C. Wilson Jr. Foundation today will announce a $100 million donation that will provide funding in perpetuity to support many of the region’s most well-known attractions. “I have never seen a grant in the cultural sector that is so far-ranging and communitywide. You are almost speechless,” said Daniel Hart, executive director…