Add `GetAllAliases()` method for alias sources

sources/Aliases/AliasSource.uc

@@ -140,6 +140,11 @@ public static function bool AreValuesCaseSensitive()
     return false;
 }
 
+public function array<Text> GetAllAliases()
+{
+    return aliasHash.GetTextKeys();
+}
+
 public function array<Text> GetAliases(BaseText value)
 {
     local int           i;

sources/Aliases/BaseAliasSource.uc

@@ -75,6 +75,34 @@ class BaseAliasSource extends AcediaObject
  */
 public static function bool AreValuesCaseSensitive();
 
+/**
+ *  Returns all aliases that are stored in the caller source/
+ *
+ *  @return Array of all aliases inside the caller alias source. All `Text`
+ *      references are guaranteed to not be `none` or duplicated.
+ */
+public function array<Text> GetAllAliases();
+
+/**
+ *  Returns all aliases that are stored in the caller source/
+ *
+ *  @return Array of all aliases inside the caller alias source. All `Text`
+ *      references are guaranteed to not be `none` or duplicated.
+ */
+public function array<string> GetAllAliases_S()
+{
+    local int           i;
+    local array<Text>   resultWithTexts;
+    local array<string> result;
+
+    resultWithTexts = GetAllAliases();
+    for (i = 0; i < resultWithTexts.length; i += 1) {
+        result[result.length] = resultWithTexts[i].ToString();
+    }
+    _.memory.FreeMany(resultWithTexts);
+    return result;
+}
+
 /**
  *  Returns all aliases that represent given value `value`.
  *