binfmt-detector-cli: rewrite to support PE32+ binaries (#38)

Rewrite with hard-coded offsets into the PE file format to discern
if a binary is PE32 or PE32+, and then to determine if it contains
a "CLR Data Directory" entry that looks valid.

Tested with PE32 and PE32+ compiled Mono binaries, PE32 and PE32+ native
binaries, and a random assortment of garbage files.

Former-commit-id: 9e7ac86ec84f653a2f79b87183efd5b0ebda001b

external/rx/Rx/NET/Resources/Artwork/Logo.ico.REMOVED.git-id

@@ -1 +0,0 @@
-2808c273d4909a467690748ced3b025f8d55c5f4

external/rx/Rx/NET/Resources/Artwork/Logo_Color_2010x2000.psd.REMOVED.git-id

@@ -1 +0,0 @@
-0d0a7de171e6c2f5acd81b81198bd9868d78feca