2) LIB_RECTANGLE and related classes sscanf data read from a file using "%s"
without field limits, which can cause problems with malformed/really long
inputs.

3) If some of the optional fields in a lib line are missing, "tmp" can remain
uninitialized.

Pcbnew: Commit patch (with very minor changes) about SVG file export with the layers ordered from bottom to top. ( bug 1286646 ), from Thiadmer Riemersma.

Remove a minor warning message in Debug mode for 2 dialogs.
Pcbnew: update Gerber X2 file format (File Attribute) to very last X2 specification
Eeschema: Fix a minor bug in block selection (sometimes the last selected component was select instead of items in selected area)
and better drag behavior when draging an item by the drag hotkey.

* Fix Bug #1348607 and a possible crash in libedit dialog component properties after moving up the first user field (which in not possible now).
* better info message in pcbnew when trying to delete a footprint in legacy library

fix Bug #1345193:  Drill Map coordinates alway 0 when using Gerber format (due to a missing plotter initialization).

Apply a workaround to fix a wxWidgets  bug in versions 3.0.x relative to mouse wheel event (Windows specific).
Therefore wxWidgets 3.0.1 can be used without need to patch it.
(This bug is fixed in wxWidgets 3.1)

Gerbview: allows x.7 format (recently indroduced in Gerber format)
Also minor coding style fixes.

Gerbview: allows x.7 format (recently indroduced in Gerber format)
Also minor coding style fixes.

Introduced SELECTION_CONDITIONS to determine which menu entries should be visible in the SELECTION_TOOL context menu, depending on the selection.

Reworked the way of processing events in TOOL_MANAGER class.
Added GetCommandStr() for TOOL_EVENT class.

Introduced a new type of action: TA_ACTIVATE to distinguish events activating tools from common tool actions.