Renamed TwinCAT.gitignore to TwinCAT3.gitignore so it's obvious this is a gitignore file only applicable for TwinCAT3 and not also TwinCAT2 (which stores everything in a big binary blob).

TwinCAT.gitignore → TwinCAT3.gitignore

@@ -1,5 +1,5 @@
-# gitignore template for TwinCAT
-# website: https://www.beckhoff.com/twincat/
+# gitignore template for TwinCAT3
+# website: https://www.beckhoff.com/twincat3/
 #
 # Recommended: VisualStudio.gitignore