Rename sources folder

Gtkmm4_UI8/res/cambalache/minesweeper.ui

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+<?xml version='1.0' encoding='UTF-8'?>
+<!-- Created with Cambalache 0.11.2 -->
+<interface>
+  <!-- interface-name minesweeper.ui -->
+  <requires lib="gtk+" version="3.24"/>
+  <object class="GtkWindow" id="minesweeper">
+    <property name="default-height">400</property>
+    <property name="default-width">700</property>
+    <property name="resize-mode">queue</property>
+    <child type="titlebar">
+      <object class="GtkStackSwitcher"/>
+    </child>
+    <child>
+      <object class="GtkStack" id="main_stack">
+        <property name="halign">baseline</property>
+        <property name="transition-type">slide-right</property>
+        <child>
+          <object class="GtkGrid" id="start_page">
+            <property name="column-homogeneous">True</property>
+            <property name="column-spacing">2</property>
+            <property name="halign">center</property>
+            <property name="row-homogeneous">True</property>
+            <property name="valign">center</property>
+          </object>
+        </child>
+        <child>
+          <object class="GtkBox" id="main_page">
+            <property name="orientation">vertical</property>
+          </object>
+        </child>
+        <child>
+          <object class="GtkGrid" id="custom_page"/>
+        </child>
+      </object>
+    </child>
+  </object>
+</interface>

Gtkmm4_UI8/res/cambalache/scoreswin.ui

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+<?xml version='1.0' encoding='UTF-8'?>
+<!-- Created with Cambalache 0.11.2 -->
+<interface>
+  <requires lib="gtk+" version="3.24"/>
+  <object class="GtkWindow" id="scores_win">
+    <child>
+      <object class="GtkBox">
+        <property name="orientation">vertical</property>
+        <child>
+          <object class="GtkTreeView" id="scores_view">
+            <property name="height-request">300</property>
+            <property name="valign">start</property>
+            <property name="width-request">400</property>
+          </object>
+          <packing>
+            <property name="position">1</property>
+          </packing>
+        </child>
+        <child>
+          <object class="GtkBox" id="btn_box">
+            <property name="height-request">3</property>
+            <child>
+              <object class="GtkLabel">
+                <property name="hexpand">True</property>
+                <property name="label"> </property>
+              </object>
+              <packing>
+                <property name="fill">False</property>
+                <property name="position">1</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkButton" id="btnclose">
+                <property name="label">Close</property>
+              </object>
+              <packing>
+                <property name="position">2</property>
+              </packing>
+            </child>
+          </object>
+          <packing>
+            <property name="fill">False</property>
+            <property name="position">2</property>
+          </packing>
+        </child>
+      </object>
+    </child>
+  </object>
+</interface>

Gtkmm4_UI8/res/cambalache/win_input.ui

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+<?xml version='1.0' encoding='UTF-8'?>
+<!-- Created with Cambalache 0.11.2 -->
+<interface>
+  <requires lib="gtk+" version="3.24"/>
+  <object class="GtkDialog">
+    <property name="expand">True</property>
+    <property name="gravity">center</property>
+    <property name="height-request">200</property>
+    <property name="margin-start">3</property>
+    <property name="width-request">400</property>
+  </object>
+</interface>