Cell renderer refactoring

[bennyboer]

Most cell renderers, especially the newer ones like the Combobox cell renderer always have the same patterns.

• Introduce AbstractCanvasCellRenderer class that already supports common actions
• Every cell should have an additional options field that is currently in most cell renderer values included
• Remove editable fields from cell renderer options
  • Instead: introduce cell renderers solely for editing like a TextEditorCellRenderer that will render a text field.
  • A global event listener is to be provided at the TableEngine options where you can defined what happens when a cell is double clicked for example
  • When a cell is double clicked the users of the library are able to exchange the cell renderer for example for a double-clicked text cell, to the text editor cell renderer and set the editor options to replace the editor again with the previous renderer when done
• Update cell renderer documentation

Refactoring checklist

• Button
• Checkbox
• Combobox
• DOM
• Row/column header
• Image
• Loading
• Progress
• Rating
• Text

To-Do

• Global event listeners to for example exchange cell renderer on double click
• Refactoring text cell renderer to not include an editor - instead create another cell renderer that is to be used instead
• Remove editable field from text cell renderer
• Update cell renderer documentation