Add compilation tests

Added a set of test inputs and expected outputs, for regression testing.

tests/samples/binding.blp

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+using Gtk 4.0;
+
+Box {
+  visible: bind box2.visible sync-create;
+}
+
+Box box2 {}

tests/samples/binding.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <object class="GtkBox">
+    <property name="visible" bind-source="box2" bind-property="visible" bind-flags="sync-create"/>
+  </object>
+  <object class="GtkBox" id="box2"></object>
+</interface>

tests/samples/child_type.blp

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+using Gtk 4.0;
+
+Window {
+  [titlebar]
+  HeaderBar {
+  }
+}

tests/samples/child_type.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <object class="GtkWindow">
+    <child type="titlebar">
+      <object class="GtkHeaderBar"></object>
+    </child>
+  </object>
+</interface>

tests/samples/layout.blp

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+using Gtk 4.0;
+
+Grid {
+  Label {
+    layout {
+      column: 0;
+      row: 1;
+    }
+  }
+}

tests/samples/layout.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <object class="GtkGrid">
+    <child>
+      <object class="GtkLabel">
+        <layout>
+          <property name="column">0</property>
+          <property name="row">1</property>
+        </layout>
+      </object>
+    </child>
+  </object>
+</interface>

tests/samples/menu.blp

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+using Gtk 4.0;
+
+menu {
+  label: _("menu label");
+  test-custom-attribute: 3.1415;
+
+  submenu {
+    section {
+      label: "test section";
+    }
+
+    item {
+      label: "test item";
+    }
+
+    item "test item shorthand 1";
+    item "test item shorthand 2" "app.test-action";
+    item "test item shorthand 3" "app.test-action" "test-symbolic";
+  }
+}

tests/samples/menu.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <menu>
+    <attribute name="label" translatable="yes">menu label</attribute>
+    <attribute name="test-custom-attribute">3.1415</attribute>
+    <submenu>
+      <section>
+        <attribute name="label">test section</attribute>
+      </section>
+      <item>
+        <attribute name="label">test item</attribute>
+      </item>
+      <item>
+        <attribute name="label">test item shorthand 1</attribute>
+      </item>
+      <item>
+        <attribute name="label">test item shorthand 2</attribute>
+        <attribute name="action">app.test-action</attribute>
+      </item>
+      <item>
+        <attribute name="label">test item shorthand 3</attribute>
+        <attribute name="action">app.test-action</attribute>
+        <attribute name="icon">test-symbolic</attribute>
+      </item>
+    </submenu>
+  </menu>
+</interface>

tests/samples/property.blp

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+using Gtk 4.0;
+
+Box {
+  orientation: VERTICAL;
+}

tests/samples/property.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <object class="GtkBox">
+    <property name="orientation">VERTICAL</property>
+  </object>
+</interface>

tests/samples/signal.blp

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+using Gtk 4.0;
+
+Button {
+  clicked => on_button_clicked() swapped;
+  notify::visible => on_button_notify_visible();
+}

tests/samples/signal.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <object class="GtkButton">
+    <signal name="clicked" handler="on_button_clicked" swapped="true"/>
+    <signal name="notify::visible" handler="on_button_notify_visible"/>
+  </object>
+</interface>

tests/samples/style.blp

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+using Gtk 4.0;
+
+Label {
+  style "class-1", "class-2";
+}

tests/samples/style.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <object class="GtkLabel">
+    <style>
+      <class name="class-1"/>
+      <class name="class-2"/>
+    </style>
+  </object>
+</interface>

tests/samples/template.blp

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+using Gtk 4.0;
+
+template TestTemplate : ApplicationWindow {}

tests/samples/template.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <template class="TestTemplate" parent="GtkApplicationWindow"></template>
+</interface>

tests/samples/using.blp

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+using Gtk 4.0;
+using GObject 2.0;
+
+GObject.Object {}

tests/samples/using.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <object class="GObject"></object>
+</interface>