Add theme support for legend ticks, add demo notebook.

Update 'Kotlin Island' demo in the gallery and add to the release folder.

Author: alshan

build.gradle.kts

@@ -34,8 +34,9 @@ allprojects {
     group = "org.jetbrains.lets-plot"
     version = when (name) {
         "dokka" -> "4.9.4"
-//        else -> "4.9.4-SNAPSHOT"
-        else -> "0.0.0-SNAPSHOT"  // for local publishing only
+//        else -> "4.10.0-SNAPSHOT"
+        else -> "4.10.0-rc1"
+//        else -> "0.0.0-SNAPSHOT"  // for local publishing only
     }
 
     tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().all {