Finish refactoring of Builder functionality into ColumnEditor module
Builder
* Reuse '_getGridOptions' method in '_getCode'
* Remove redundant code for building grid configuration options object
toJavaScript:
* Remove unnecessary 'exclude' option
* Bugfix: ensure 'inline' option only affects top-level properties
ColumnGrid: Add row reordering with DnD
Builder: reorganize generated dgrid code
Minor fixes and code improvements