* Fix bug in PCBNEW dialog_pad_properties.cpp that I introduced several days ago.
  The m_Master_Pad stuff is stored in the PCB_EDIT_FRAME's BOARD_DESIGN_SETTINGS,
  not in the FOOTPRINT_EDIT_FRAME's BOARD_DESIGN_SETTINGS (i.e. not stored in 
  the module editor's dummy BOARD).  Now we properly initialize the
  DIALOG_PAD_PROPERTIES::m_Pad_Master reference to the correct master pad
  dope, instead of to the dummy module BOARD's master pad, which is not used.

If enable in preference menu, allow the pan with drag mouse with middle button down.
both unlimited and limited pan is allowed.

Some minor code cleaning.

Enhancements in AddMenuItem (that accepts now a menu type)
Partial use of the Edwin van den Oetelaar's patch (patch not fully working or correct)

But when using raw printing (for linux - 'lpr some_file.ps') the bug gets out.

Alexander.

Instrument saveNETCLASS() with fmtBIU().
Can now round trip to mm board file using LEGACY_PLUGIN in DEBUG build.

*) Allow building without defining 
        USE_NEW_PCBNEW_LOAD & USE_NEW_PCBNEW_SAVE.
	pcbnew/files.cpp would not link.

* Save dialog now supports saving boards to new file format.
* Add CMake option to build s-expression file save.
* Add check to main CMakeList.txt file to make sure nanometers are
  enables when the new file format is built.
* Minor tweaks to object format functions for improved output.
* Rename kicad_plugin.h/cpp to legacy_plugin.h/cpp.

This uses the new LEGACY_PLUGIN, so we can force more usage & testing of it
before ioascii.cpp and item_io.cpp are deleted, along with 
BOARD_ITEM::Save() and BOARD_ITEM::ReadDescr() associated functions.

* support for 3 terminal regulators
* add a data file management to store parameters for regulators ( name, vref value, Iadj value, type)
Needs some refinements, but it is already very useable.

 Commit dialog page setting patch from Alexander Zakamaldin

* Add s-expression Format() function to all objects derived from
  BOARD_ITEM.
* Add s-expression Format() function to base objects as required.
* Add functions to convert coordinates from base internal units
  (nanometers) to millimeter string for writing to s-expression
  file.
* Add temporary dummy conversion functions to prevent link errors
  until schematic and board object and action code can be separated
  into DSO/DLL.
* Add CMake build option to build Pcbnew with nanometer internal
  units.

Eeschema: one string with a bad char (\a, not useable in internationalized strings).
Dialog_page_settings: use not translated strings in code, so strings can be freely translated for the UI.
(Initial code was not working with existing translations)
Update 2 icons.

* BLOCK_SELECTOR class is not longer derived from EDA_ITEM.
* Encapsulate BLOCK_SELECTOR class member variables and add access methods.
* Move HandleBlockBegin() function from block_commande.cpp to drawframe.cpp.
* Remove virtual methods from top level derived objects per future
  coding policy change.
* Remove Doxygen copydoc statement from objects derived from EDA_ITEM
  since the comments are automatically copied to the derived object.
* Removed copy and pasted Doxygen comments from objects derived from
  EDA_ITEM.

class EDA_RECT: is no more derived from EDA_ITEM, just from EDA_RECT (reason: does not use anything in EDA_ITEM)
issue in cast to wxRect fixed (EDA_RECT accepts negative size, but not wxRect, so the wxRectcast  is normalized now).
This fixes some bugs.
A minor other bug fix in Pcbnew.

subclass DIALOG_SHIM support.
Tried dialog_drc but it has nesting problems due to use of DRCLISTBOX, which
needs to be put into its own header file to untangle.

Add include/dialog_shim.h and common/dialog_shim.cpp for use by wxformbuilder's "subclass a wxDialog" support.
This works, but in my version of wxformbuilder there is a bug which does not properly show the 
subclass property, even though it is still in play.  This happens after saving then loading the *.fbp file.
So it is a nuisance bug, but does not affect functionality.

Remove 2 duplicate icons.
Minor cosmetic enhancements and fixes in popup menus.