mipt-npm/dataforge-core: 0.4.0

[0.4.0] Added

• LogManager plugin
• dataforge-context API dependency on SLF4j
• Context withEnv and fetch methods to manipulate plugins without changing plugins after creation.
• Split ItemDescriptor into builder and read-only part

• Kotlin-logging moved from common to JVM and JS. Replaced by console for native.
• Package changed to space.kscience
• Scheme made observable
• Global context is a variable (the singleton is hidden and will be deprecated in future)
• Kotlin 1.5
• Added blank builders for children context.
• Refactor loggers

• Direct use of PluginManager

• Common dependency on Kotlin-logging
• Kotlinx-io fork dependency. Replaced by Ktor-io.

• Scheme properties properly handle children property change.