Replace Rustybuzz with Parley for text layout, and add text tilt parameter (#2739)

* replace rustybuzz with parley for text layout handling

change text input direction based on text direction

* Code review

* change default character spacing to 0

* add shear to text node

this also adds migration code for documents that don't have shear

* shear migration for text node

- add shear property
- set character spacing to 0

* use old max_width and max_height in text migration if available

* Final code review pass

* Add units to the parameters

---------

Co-authored-by: Keavon Chambers <[email protected]>

Author: BKSalman

.gitignore

@@ -5,3 +5,4 @@ perf.data*
 profile.json
 flamegraph.svg
 .idea/
+.direnv

.nix/flake.nix

@@ -51,7 +51,7 @@
           libraw
 
 
-          # Tauri dependencies: keep in sync with https://v2.tauri.app/start/prerequisites/
+          # Tauri dependencies: keep in sync with https://v2.tauri.app/start/prerequisites/#system-dependencies (under the NixOS tab)
           at-spi2-atk
           atkmm
           cairo