Update patch notes

patch_notes/v0.27.md

@@ -1,12 +1,39 @@
 ### v0.27.0
 
+This update brings UDMF support out of beta with an official `dsda` UDMF namespace, adds MAPINFO support, and fixes a ton of bugs. Other highlights include a smooth light fade option for opengl, improvements to the build mode, and (retroactive) ambient sound support.
+
 #### MAPINFO
-- Added support for MAPINFO for UDMF maps
+- Added support for MAPINFO
   - Includes episode, cluster, map, and skill definitions
   - Configure gravity, jumping, special activation rules, and much more.
+  - MAPINFO is opt-in and can be enabled in a wad by adding `use_mapinfo` to the DSDAPREF lump
   - See the full specification [here](../docs/mapinfo.md).
+- Added new MAPINFO features
+  - `Passover` and `NoPassover` map flags (enable or disable finite height)
+  - `Colormap` property to change map colormap (e.g., for underwater levels)
+- MAPINFO is intended for use with UDMF maps, but legacy map formats have access to some features
 
 #### UDMF
+- Finalized the dsda UDMF namespace
+  - See the full specification [here](../docs/udmf.md).
+- Optimized the custom udb config to remove obsolete specials and arguments
+- Added new UDMF features
+  - Wall texture scrolling properties (no special action required)
+    - xscroll[top, mid, bottom], yscroll[top, mid, bottom]
+  - Floor / ceiling scrolling properties (no special action required)
+    - xscroll[floor, ceiling], yscroll[floor, ceiling], scroll[floor, ceiling]mode
+    - The scroll mode decides whether textures, static objects, players, and / or monsters are affected
+  - Sector thrust properties (no special action or object required)
+    - xthrust, ythrust, thrustgroup, thrustlocation
+    - The thrust group determines whether static objects, players, monsters, projectiles or WINDTHRUST actors are affected
+    - The thrust location determines whether grounded, airborne, or ceiling actors are affected
+  - Separate floor and ceiling skies as sector properties (no special action needed)
+  - Friction as a sector property (no special action required)
+    - frictionfactor and movefactor
+  - Colormap quality of life
+    - Colormap as a sector property (no special action or control sector needed)
+    - Special action Map_SetColormap (change the map colormap)
+    - Special action Sector_SetColormap (change the colormap for a sector tag)
 - Fixed the "slow scrollers don't move objects" bug
 
 #### Ambient Sound / SNDINFO