Unescape any escaped character in article text

Apply the general DSL rule \X -> X instead of unescaping only brackets
and parentheses, so sequences like \! no longer show the backslash.

app/src/main/java/com/example/research/ui/article/DslAnnotatedParser.kt

@@ -23,7 +23,6 @@ object DslAnnotatedParser {
         "br", "p", "b", "i", "c", "t", "m", "m0", "m1", "m2", "m3", "m4", "m5",
         "ref", "ex", "e", "trn", "com", "lang", "sup", "'"
     )
-    private val ESCAPED_CHARS = setOf('[', ']', '(', ')')
 
     data class ColorScheme(
         val secondaryText: Color,
@@ -101,15 +100,13 @@ object DslAnnotatedParser {
                 '\\' -> {
                     if (i + 1 < length) {
                         val next = dsl[i + 1]
-                        if (next in ESCAPED_CHARS) {
-                            builder.append(next)
-                            if (refStack.isNotEmpty()) {
-                                refStack.last().second.append(next)
-                            }
-                            lastChar = next
-                            i += 2
-                            continue
+                        builder.append(next)
+                        if (refStack.isNotEmpty()) {
+                            refStack.last().second.append(next)
                         }
+                        lastChar = next
+                        i += 2
+                        continue
                     }
                     builder.append(char)
                     if (refStack.isNotEmpty()) {