Refactor @ngx-dino/core

[bherr2]

Refactor the core library

• Operators need cleaned up
  • Simplify
  • More consistent with rxjs
  • Chain -> Pipe
  • Move away from Immutable
• Multiple entry points
  • core/operators
  • core <- Field, Operator, processing* goes here (just not ops?)
• Move stuff out to @ngx-dino/toolshed
  • Move logging to ToolShed
  • Move directives/auto-resize to Toolshed
  • Move to-string-helper to toolshed (if its useful)
• Replace Field with BoundField