Pcbnew: Partial merge from pcad2kicad (from Alexander Lunev). Fix an old bug related to pads with offset: sometimes the connection to a zone was not detected.

* Fix all Doxygen warnings except polygon files.
* Add footprint library table tasks to TODO.txt.
* Add definition to drag.h to prevent nesting.
* Coding policy fixes.

Pcbnew: fix Bug #1148785 (pcbnew crashes when using only one layer in autorouter ) , and a minor bug in dialog cleanup.

Still fix minor issues in dialog_edit_module_for_BoardEditor.cpp (noticeable only for non English users)

* Fix spacing and consistency issues and debug warning due to improper flex
  grid sizer in module editor module properties dialog.
* Fix spacing and consistency issues in Pcbnew module properties dialog.
* Fix spelling error in DRC dialog message box text.

Eeschema: fix broken  mirroring for texts and labels in block mirror X and Y (this fixes Bug #1135505)
Pcbnew: add in module popup menu an option to edit the footprint in Modedit (like in Eeschema for components)
minor icons enhancements.

CMakeLists.txt: use elseif token instead of elif which create strange issues with some cmake versions.
Fix minor issues in nsis config files

Fix minor issues in nsis config files

* Make Pcbnew net list dialog honor escape key on Linux.
* Make Pcbnew swap layers dialog honor escape key on Linux.
* Layout and UI policy fixes for Pcbnew swap layer and net list dialogs.
* Layout and UI policy fixes for Eeschema plot dialog.
* Rename fpip.h to fpid.h.
* Fix FPID class compiler errors.
* Restore fpid.cpp to Pcbnew static library source list.

wxID_CANCEL, 5 pixel border around sizers, resizable search combobox, dialog_shim usage on a few dialogs

Pcbnew: plot Dialog: add a popup menu (try mouse right click in plot dialog) to selected/unselect groups of layers to plot.
All: For new zoom centering option: use Shift+Ctrl key instead of Alt key to select the new zoom centering, because Alt key has a special function under Windows.
2 very minor other changes.

Pcbnew: Export vrml: fix an issue for 3D shapes having a local offset defined: the local offset was not correctly scaled.

the crosshair after zooming.

This method is only used when the ALT key is held while using the mousewheel or
if it's permanently enabled in the options dialog next to the middle mouse
button panning option.