grid column renderer scope cleanup

• the default for the rendererScope is now the grid.View.
• component based grid columns change it to match the column instance instead.

This fixed an issue we had inside Neo.examples.grid.cellEditing.MainContainer.

All changes in 1 commit: https://github.com/neomjs/neo/commit/3ad9f27b3122056876f0023175e61821b4271771