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/cable/cabletextformatdialog.h

@@ -0,0 +1,83 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef CABLETEXTFORMATDIALOG_H
+#define CABLETEXTFORMATDIALOG_H
+
+#include "cable.h"
+
+#include <QDialog>
+
+class QComboBox;
+class QFontComboBox;
+class QDoubleSpinBox;
+class QLabel;
+class QPushButton;
+
+/**
+	@brief The small window where one text of one cable is set: the font
+	it is written with -- family, size and style -- and, for the texts
+	written next to the trunk line, the way it lines up at the line.
+
+	The colours of the cores come here as well, all of them together
+	because they are drawn together: they have no alignment, being
+	turned by a quarter along their own line.
+
+	Saying nothing is the normal case: the cable then follows what the
+	preferences offer on the "Textes" page, and OK keeps an answer of
+	its own only when he really changed something -- so that picking
+	another default later on still reaches this cable.
+*/
+class CableTextFormatDialog : public QDialog
+{
+		Q_OBJECT
+
+	public:
+		/**
+			@param format what this cable writes that text with right
+			now, an empty format when it merely follows the preferences
+			@param cores true for the colours of the cores: they have
+			no alignment and follow QETApp::cableCoreFont()
+			@param parent
+		*/
+		CableTextFormatDialog(const CableTextFormat &format,
+							  bool cores,
+							  QWidget *parent = nullptr);
+
+			///What the cable is to write that text with from now on
+		CableTextFormat format() const;
+
+	private:
+		void buildUi();
+		void updatePreview();
+		QFont chosenFont() const;
+
+		bool m_cores = false;
+			///True when he asked to go back to following the preferences
+		bool m_reset_chosen = false;
+			///The alignment this text has right now, 0 for the cores
+		int m_initial_alignment = int(Qt::AlignRight);
+
+		QFontComboBox *m_family = nullptr;
+		QDoubleSpinBox *m_size = nullptr;
+		QComboBox *m_style = nullptr;
+		QComboBox *m_alignment = nullptr;
+		QLabel *m_preview = nullptr;
+		QPushButton *m_reset = nullptr;
+};
+
+#endif // CABLETEXTFORMATDIALOG_H