CopyFrom Strategies

[pauxus]

Split of from #304

Allow to determine the behaviour of copyFrom on class and field base (i.e. new Annotation or fields of Field/DSL annotation).

Configurable behaviours:

• map:
  • adds, overrides existing matching keys
  • fails on matching keys
  • replaces map entirely
  • replaces map entirely even if empty
• list:
  • adds to list
  • replaces list (like helm)
  • replaces list even if empty
• single field:
  • replace
  • replace even with empty value

Also (LHF), override copyFrom methods to include the strategy explicitly