Blender Git Loki

Did not rename operator properties properly in all cases.

Fixed drag and drop for custom panels, added copying of operator properties. Also did minor code cleanup:

* combined add & delete panel icons in the tool shelf
* delete some of my old commented out code
* fixed drop poll for the toolbar
* changed default value for the layout property 'single_unit'

Failed attempt at refreshing popup blocks in commented code.

Incorrectly restored UI_EMBOSS, which caused the pullout buttons on areas to be drawn incorrectly.

Adds an option in the right-click menu for dividers to remove the divider from the menubar.

Fixes a small bug whereby an RNA pointer was improperly created. Also removes the option to remove a button from a non-custom panel that was erroneously shown.

Added an option to pin the operator redo panel. When it is pinned it stays open when the toolbar is closed.

Dividers can now be dragged. Buttons display a bit of text if there is no icon yet.

Dividers can be folded, but not dragged yet.

Added dividers and made the tool shelf context dependent

Implemented drag and drop for the icon shelf. Removed code for menubar menus that was commented out.

Small tweaks to the custom panel button dragging.

Added a separate SVG file for operator icons.

Buttons in the icon shelf are now icon-only. The region and buttons are 1.5 * the normal button size. Adding and removing buttons take into account the operator properties.

Custom buttons in the menubar copy over the operator properties from the operator button that was dragged there.

When an operator button is dragged the but->opptr is copied to the drag event so that it can then be copied to in the drag&drop copy() functions.

Started to implement operator to icon pairing.

* wmOperatorType has an extra icon() method that is used to determine which icon to use based on the operator properties set for a button.
* wmOperatorType has a default_icon field, exposed to python as bl_icon, that is used if the icon() function is not set.
* Buttons have to have a but->icon value of ICON_AUTOMATIC, which is -1.

The toolbar did not properly redraw when a panel was hidden in case the region overlap was off.

Hidden panels did not survive a save and load. This fixes that by making sure the panels' types are set.

The popup menu to hide panels now shows the toggles in the right order.