Add writeable flag to mutable properties

# Conflicts:
#	demo/all-things/build.gradle.kts

build.gradle.kts

@@ -7,6 +7,7 @@ plugins {
 }
 
 val dataforgeVersion: String by extra("0.6.2")
+val visionforgeVersion by extra("0.3.0-dev-10")
 val ktorVersion: String by extra(space.kscience.gradle.KScienceVersions.ktorVersion)
 val rsocketVersion by extra("0.15.4")
 val xodusVersion by extra("2.0.1")

controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DeviceSpec.kt

@@ -127,7 +127,8 @@ public abstract class DeviceSpec<D : Device> {
         PropertyDelegateProvider { _: DeviceSpec<D>, property: KProperty<*> ->
             val propertyName = name ?: property.name
             val deviceProperty = object : WritableDevicePropertySpec<D, T> {
-                override val descriptor: PropertyDescriptor = PropertyDescriptor(propertyName).apply(descriptorBuilder)
+                override val descriptor: PropertyDescriptor = PropertyDescriptor(propertyName, writable = true)
+                    .apply(descriptorBuilder)
                 override val converter: MetaConverter<T> = converter
 
                 override suspend fun read(device: D): T? = withContext(device.coroutineContext) { device.read() }