WEEK 13 JavaDataflow

Last week achievements.

jeo-maven-plugin:
- Extended `DataType` class to handle default field values and `null` values without NPEs [#518]
- Fixed the issue with disassembling/assembling default field values known at compile time [#488]
- Added support for labels disassembling/assembling to work with lambdas [#515]
- Identified and prepared for implementing lambdas support in the future [#488]

Next week plans:
jeo-maven-plugin:
- <leave empty>

Risks:
jeo-maven-plugin:
- <leave empty>