Include bitmap images in PDF plots, preview, and printing

Include decoded IMAGE/OLE content in the shared PDF plotting path,
with clipping, transforms, transparency, draw order, and resource reuse.
Use named page content for export and printing.

Fixes #1266

Cargo.lock

@@ -4601,6 +4601,7 @@ dependencies = [
  "base64",
  "flate2",
  "getrandom 0.3.4",
+ "image",
  "lopdf",
  "serde",
  "serde_derive",