Version 2.45.7
- Fix #463 - Don't panic if an SVG has character data outside the
  first element.

- Fix #467: Don't panic when there's an xi:include fallback with no
  parent element.  Thanks to Bastien Orivel for running afl-fuzz
  on librsvg.

- Fix #471: Fix blurry semi-opaque objects when rendering with a
  scaled transformation.  Thanks to the gnome-games people for
  isolating a test case and to Evgeniy Reizner for providing a more
  minimal one.

- Fix #481: Don't ignore the first x/y/dx/dy in text/tspan elements if
  there is more than one position specified.

- #452 - In librsvg_crate, SvgHandle now has a ::has_element_with_id()
  method.

- rsvg-convert now catches the case where the SVG has no dimensions.

- Replaced the Visual Studio build infrastructure for NMake
  (Chun-wei Fan).

- This version no longer contains the rsvg-view program, so librsvg no
  longer depends on GTK.  Please see
  https://people.gnome.org/~federico/blog/removing-rsvg-view.html for
  the rationale behind this change.

- The poly element no longer supports "verts" as an alias for the
  "points" attribute.  The "verts" name was only used in SVG pre-1.0,
  and we had been cargo-culting that name ever since.

- We now use more machinery from Mozilla Servo, in this case the
  markup5ever and rust-selectors crates.  This is in line with
  gradually replacing libcroco with a Rust-only CSS machinery.

- Lots and lots of refactoring and cleanups:  use the rctree crate
  instead of our own tree representation; remove interior mutability
  in element structs; make the gradients and patterns code less
  repetitive (Paolo Borelli).

- Update some dependencies (Bastien Orivel).

- New section in COMPILING.md about cross-compilation to Windows using
  mingw (Takuro Ashie)

- Fix static linking and Windows builds (Kleis Auke Wolthuizen).