UPDATED!!! GMS v2.3+ VERSION NOW INCLUDES MORE SCRIPTS; MORE TOOLS; AND BOTH 16 AND 47 TILE AUTOWALL!!!!!
This set of scripts permits you to add autowall (autotile) features to your game at runtime and is exclusive to GMS2.
The 16 frame autowall is the standard type that you will find anywhere on the internet while the 47 frame autowall is based off of the built in GMS2 autotile configuration and so you can create maps in the room editor, and then use these scripts to change them at run time while maintaining the autowall features (destructible terrain, anyone?).
You can test out the features of this asset with the playable demo!!!
v2.0.1: Fixed minor bug with DS grid out of bounds causing the scripts to crash on HTML5 target when deleting a rectangular area of autowalls.