Analysis: Resolve kotlin stdlib's to lower case deprecated warnings

Warning Message: "'toLowerCase(Locale): String' is deprecated.
Use lowercase() instead."

Replacing 'toLowerCase(...)' with 'lowercase(...)' is the recommended
action to resolve this kind of deprecated warnings.

Author: ParaskP7

aztec/src/main/kotlin/org/wordpress/aztec/AztecTagHandler.kt

@@ -53,6 +53,7 @@ import org.wordpress.aztec.spans.createTaskListSpan
 import org.wordpress.aztec.spans.createUnorderedListSpan
 import org.wordpress.aztec.util.getLast
 import org.xml.sax.Attributes
+import java.util.Locale
 
 class AztecTagHandler(val context: Context, val plugins: List<IAztecPlugin> = ArrayList(), private val alignmentRendering: AlignmentRendering
 ) : Html.TagHandler {
@@ -75,7 +76,7 @@ class AztecTagHandler(val context: Context, val plugins: List<IAztecPlugin> = Ar
             return true
         }
 
-        when (tag.toLowerCase()) {
+        when (tag.lowercase(Locale.getDefault())) {
             LIST_LI -> {
                 val span = createListItemSpan(nestingLevel, alignmentRendering, AztecAttributes(attributes))
                 handleElement(output, opening, span)

aztec/src/main/kotlin/org/wordpress/aztec/AztecText.kt

@@ -132,6 +132,7 @@ import java.security.MessageDigest
 import java.security.NoSuchAlgorithmException
 import java.util.Arrays
 import java.util.LinkedList
+import java.util.Locale
 
 @Suppress("UNUSED_PARAMETER")
 open class AztecText : AppCompatEditText, TextWatcher, UnknownHtmlSpan.OnUnknownHtmlTappedListener, IEventInjector {
@@ -1818,7 +1819,7 @@ open class AztecText : AppCompatEditText, TextWatcher, UnknownHtmlSpan.OnUnknown
             // Android 8 Ref: https://github.com/wordpress-mobile/WordPress-Android/issues/8827
             clipboardIdentifier -> {
                 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N && Build.VERSION.SDK_INT < Build.VERSION_CODES.P
-                        && Build.MANUFACTURER.toLowerCase().equals("samsung")) {
+                        && Build.MANUFACTURER.lowercase(Locale.getDefault()).equals("samsung")) {
                     // Nope return true
                     Toast.makeText(context, context.getString(R.string.samsung_disabled_custom_clipboard, Build.VERSION.RELEASE), Toast.LENGTH_LONG).show()
                 } else {

aztec/src/main/kotlin/org/wordpress/aztec/spans/AztecHeadingSpan.kt

@@ -20,7 +20,7 @@ fun createHeadingSpan(nestingLevel: Int,
                       alignmentRendering: AlignmentRendering,
                       headerStyle: BlockFormatter.HeaderStyles = BlockFormatter.HeaderStyles(0, emptyMap())
 ): AztecHeadingSpan {
-    val textFormat = when (tag.toLowerCase(Locale.getDefault())) {
+    val textFormat = when (tag.lowercase(Locale.getDefault())) {
         "h1" -> AztecTextFormat.FORMAT_HEADING_1
         "h2" -> AztecTextFormat.FORMAT_HEADING_2
         "h3" -> AztecTextFormat.FORMAT_HEADING_3

wordpress-comments/src/main/java/org/wordpress/aztec/plugins/wpcomments/WordPressCommentsPlugin.kt

@@ -9,6 +9,7 @@ import org.wordpress.aztec.Constants
 import org.wordpress.aztec.plugins.html2visual.IHtmlCommentHandler
 import org.wordpress.aztec.plugins.visual2html.IInlineSpanHandler
 import org.wordpress.aztec.plugins.wpcomments.spans.WordPressCommentSpan
+import java.util.Locale
 
 class WordPressCommentsPlugin(private val visualEditor: AztecText) : IInlineSpanHandler, IHtmlCommentHandler {
 
@@ -33,7 +34,8 @@ class WordPressCommentsPlugin(private val visualEditor: AztecText) : IInlineSpan
 
         val spanStart = output.length
 
-        if (text.toLowerCase() == WordPressCommentSpan.Comment.MORE.html.toLowerCase()) {
+        if (text.lowercase(Locale.getDefault()) ==
+                WordPressCommentSpan.Comment.MORE.html.lowercase(Locale.getDefault())) {
 
             output.append(Constants.MAGIC_CHAR)
 
@@ -49,7 +51,8 @@ class WordPressCommentsPlugin(private val visualEditor: AztecText) : IInlineSpan
                     Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
             )
             return true
-        } else if (text.toLowerCase() == WordPressCommentSpan.Comment.PAGE.html.toLowerCase()) {
+        } else if (text.lowercase(Locale.getDefault()) ==
+                WordPressCommentSpan.Comment.PAGE.html.lowercase(Locale.getDefault())) {
 
             output.append(Constants.MAGIC_CHAR)