Add cable management: drawing, cores, numbering, cross-references and cable list

Cables are drawn line objects (toolbar button next to the auto
break/reconnect button, click-move-click, right click cancels), not
components. The type comes from a CSV catalog following the material
list pattern (designation, cores, core colours, editable through the
entry dialog with "Nouvelle entrée" / "Modifier l'entrée").

Each core is bound to the wire its colour label stands on, and the
cable reference is generated per core and written into the Conductor
entry via Conductor::setCableReference(label, cable uuid, slot). The
conductor entry is where it has to live because the terminal strip
plan (Klemmenplan) consumes it in the next step.

Numbering: "Cables" rule under Programmeinstellungen/Neues
Projekt/Nummerierung auto (mirrored in project properties), literal
"W" fallback without a rule, French gate dialog when no rule exists,
Nummerierung menu with the renumber dialog (preferred axis, per-folio
counter, rule and counter state written back, hand-typed names ask,
whole-project scope).

Also included: label block and under-line texts with per-text font and
alignment plus the material-list cell margins, free-core placement and
right-click removal, claim questions for wires of other cables,
multi-selection drag as one undo step, type change with confirmation,
cross-references for type "Cable" (%f-%l%c, own font, clickable links
in exported PDFs), report propagation of the cable definition,
Listes menu (table of contents, material list, terminal strip manager,
terminal generator plugin, cable list), cable list with freely
selectable columns (installation/localisation of cable, start and end,
Blatt start/end, length, used cores...), CSV export dialog with column
pick and preview in the Projekt menu, script API (addTable kind
"cable_list", exportCableList) and a unit test for the type catalog.

sources/scripting/qetscriptapi.h

@@ -189,7 +189,8 @@ class QetGraphicsTableItem;
 	  button applies, not a rule reimplemented here. sortTerminalStrip()
 	  reorders the strip's physical positions into the canonical order the
 	  editor's own sort button computes.
-	- @b Tables: a BOM/nomenclature or a summary (table of contents) placed
+	- @b Tables: a BOM/nomenclature, a summary (table of contents) or a
+	  cable list placed
 	  on a folio, through QetGraphicsTableFactory::create() -- the same
 	  factory call the "add table" menu action makes, minus the modal
 	  AddTableDialog it collects its settings from first. That dialog is
@@ -201,7 +202,11 @@ class QetGraphicsTableItem;
 	  calling addTable() once should create exactly the one table it asked
 	  for, not possibly several spread across folios it never asked to add.
 	  A script that wants either behaviour can resize the result itself or
-	  add its own folio.
+	  add its own folio. kind is "nomenclature" (over placed elements),
+	  "summary" (over folios) or "cable_list" (over the cables of the
+	  project): the first two require a real SQL query, the last takes
+	  comma-joined column keys instead and accepts an empty query, which
+	  means its default columns.
 
 	  Neither creating nor deleting a table is undoable:
 	  QetGraphicsTableFactory::newTable(), which create() calls, calls
@@ -368,6 +373,7 @@ class QetScriptApi : public QObject
 		Q_INVOKABLE bool exportCables(const QString &output);
 		Q_INVOKABLE bool exportWires(const QString &output);
 		Q_INVOKABLE bool exportBom(const QString &output);
+		Q_INVOKABLE bool exportCableList(const QString &output);
 		Q_INVOKABLE bool exportWiring(const QString &output);
 		Q_INVOKABLE bool exportNets(const QString &output);
 		Q_INVOKABLE bool exportLinks(const QString &output);