Update version to 0.4

Optimize references in generated code. Also fixes Kotlin/kotlinx.serialization/issues/65

Fix (again) broken char boxing

Rebased on 1.2.40 and fixed broken compatibility

Fix https://github.com/Kotlin/kotlinx.serialization/issues/107 and code reformatting

(cherry picked from commit d4c307d)

Add correct type parameter information to synthetic declarations

Needed by kapt due to https://github.com/Kotlin/kotlinx.serialization/issues/76

Make correct call to sealed class constructor

Fixes https://github.com/Kotlin/kotlinx.serialization/issues/112

Bump version

1.2.50-eap-1 compatible

libraries/tools/kotlin-maven-serialization/pom.xml

@@ -19,7 +19,7 @@
     <groupId>org.jetbrains.kotlinx</groupId>
     <artifactId>kotlinx-maven-serialization-plugin</artifactId>
     <packaging>jar</packaging>
-    <version>0.3</version>
+    <version>0.5.0</version>
     <description>Serialization plugin for Maven</description>
 
     <repositories>