[Batch File] Tweak comment collapsing (#3865)

This commit introduces two changes:

 - `@rem` (silenced `rem`) and `:::` (safe equivalent of `::`) have been added
 - `rem` and its silent equivalent `@rem` now use `TM_COMMENT_CASE_INSENSITIVE`
   introduced in Sublime Text 4153, which allows collapsing comments casefold

Batch File/Comments.tmPreferences

@@ -13,12 +13,36 @@
 				<key>value</key>
 				<string>rem </string>
 			</dict>
+			<dict>
+				<key>name</key>
+				<string>TM_COMMENT_CASE_INSENSITIVE</string>
+				<key>value</key>
+				<string>yes</string>
+			</dict>
 			<dict>
 				<key>name</key>
 				<string>TM_COMMENT_START_2</string>
 				<key>value</key>
+				<string>@rem </string>
+			</dict>
+			<dict>
+				<key>name</key>
+				<string>TM_COMMENT_CASE_INSENSITIVE_2</string>
+				<key>value</key>
+				<string>yes</string>
+			</dict>
+			<dict>
+				<key>name</key>
+				<string>TM_COMMENT_START_3</string>
+				<key>value</key>
 				<string>:: </string>
 			</dict>
+			<dict>
+				<key>name</key>
+				<string>TM_COMMENT_START_4</string>
+				<key>value</key>
+				<string>::: </string>
+			</dict>
 		</array>
 	</dict>
 </dict>