New alphabetical chapter sort (#10073)

* added alphabetical chapter sorting

* Deleted sort_by_alphabet and re-utilized action_sort_alpha

* Accidentally deleted wrong string. Now solved

* Accidentally deleted wrong string. Now solved

Deleted sort_by_source instead of sort_by_alphabet in strings.xml.
Now reverted.

* Alphabetical sorting now uses Collator

* Clean up repeated Collator instances

---------

Co-authored-by: arkon <eugcheung94@gmail.com>

core/src/main/java/tachiyomi/core/util/lang/SortUtil.kt

@@ -0,0 +1,15 @@
+package tachiyomi.core.util.lang
+
+import java.text.Collator
+import java.util.Locale
+
+private val collator by lazy {
+    val locale = Locale.getDefault()
+    Collator.getInstance(locale).apply {
+        strength = Collator.PRIMARY
+    }
+}
+
+fun String.compareToWithCollator(other: String): Int {
+    return collator.compare(this, other)
+}