Add long-term roadmap

content/wiki/long-term-roadmap.md

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+# Post-July Linebender roadmap
+
+## Vello
+
+* Emoji
+* Image filters / blur / shadows
+    * Render graph (Raph to drive, see [thread](https://xi.zulipchat.com/#narrow/stream/197075-gpu/topic/Render.20Graph))
+* Gpu embedding / wgpu engine abstraction (see [Servo thread](https://xi.zulipchat.com/#narrow/stream/147922-new-members/topic/Greg.20from.20Servo))
+* Glyph caching
+    * Render graph? 
+    * or CPU side? 
+    * (sparse strips probably)
+* Frame pacing
+* Damage regions
+    * MVP: just render sub-rects
+* CPU impl
+    * Testing
+    * Downlevel
+* Fuzzing?
+
+## Masonry
+
+* ‘Compositing’
+* Frame pacing (relevant to Vello and AccessKit)
+* Damage regions
+* Styling options
+* Copy features from [Tomorrow Corporation Tech Demo](https://www.youtube.com/watch?v=72y2EC5fkcE)
+
+## Parley
+
+* IME support
+    * Suggestion regions?
+* Split out blob & other vocabulary types
+    * Blob may be prioritized by other project needs
+
+## Xilem
+
+* Android
+    * Material UI style widgets/views? Requires styling
+* Styling
+* Hot reloading
+* Async behavior in Masonry widgets (image loading etc)
+* Cleanup run for issues and PRs