* Factor out PROPERTIES object from the PCB plugin code and move it into
common so it can be used by both the Pcbnew and Eeschema plugins.
* Add schematic I/O plugin manager for loading and saving schematic and
component library files.
* Add initial attempt at a parser for current schematic file format. This
parser will be infinitely more strict than the current parser which is very
forgiving in what it parses.
* Make minor changes to the base bitmap class to support the new parser.
* Add find root sheet support to sheet object to allow fetching the root
sheet from any sheet in the stack.
Following rev 6627 (git 2777182), if a non-duplicatable item was the object of
a Duplicate action, the original item would be picked up, potentially
misleading the user into thinking something was actually duplicated.
* No initial copied object changed (this was a serious bug to modify these objects. Previous version modified references and other texts using a very stupid algorithm).
It also fixes bug 1549231
* only new pads are numbered (therefore renumbering is used only in footprint editor)
* remove not working and useless feature in circular array: now only use number for pads (others options using alphabetical letters are removed: did not work corectly, and were useless)
* a more clear option is used to choose if the pads are numbered from a choosen value, or from the first avaible value
* Adding a warning messsage if a parameter is incorrect.
The standard library requires iterators passed to functions that modify the
container to be mutable iterators, but GCC's implementation accepts
const_iterator in some places where these are only used to mark a place,
but the actual modification happens through a different parameter.
As this breaks implementations that use the passed iterator to modify the
container (e.g. because they use a different data organization), this is
not portable; because we already have a non-const reference to the
container anyway, this is trivially fixed as well.
This was apparently left in from debugging earlier, and should no longer be
needed. Since it uses a GCC extension, it makes compilation on others fail.