Add tables to enterprise tree

[mariuspopovici]

Load dictionary and database tables in the enterprise tree.

• implement table context menu with the following commands

  • send to editor (investigate if we can drag & drop items from the tree into the editor)
  • generate insert
  • generate update
  • generate delete
  • generate select

• implement schema viewer

  • on click load table schema in a webview panel

Other ideas:

• generate .puml representation of the table
• implement an ERD generator

[MrDoe]

Functions still missing:

• edit table definition after checkout (add, edit columns, indexes and foreign keys)
• browse table contents