Move StringBuilderExtensions to utils

app/src/main/java/exh/metadata/metadata/base/RaisedSearchMetadata.kt

@@ -16,7 +16,7 @@ import exh.metadata.metadata.TsuminoSearchMetadata
 import exh.metadata.sql.models.SearchMetadata
 import exh.metadata.sql.models.SearchTag
 import exh.metadata.sql.models.SearchTitle
-import exh.plusAssign
+import exh.util.plusAssign
 import kotlinx.serialization.Polymorphic
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.Transient

app/src/main/java/exh/search/Text.kt

@@ -1,6 +1,6 @@
 package exh.search
 
-import exh.plusAssign
+import exh.util.plusAssign
 
 class Text : QueryComponent() {
     val components = mutableListOf<TextComponent>()

app/src/main/java/exh/util/StringBuilderExtensions.kt

@@ -1,3 +1,3 @@
-package exh
+package exh.util
 
 operator fun StringBuilder.plusAssign(other: String) { append(other) }