Add project files.

source/examples/HotReloadDemo/PluginV2/src/CppWidget.cpp

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+/* CppWidget V2 -- "after your edit". See PluginV1/src/CppWidget.cpp
+ * for "before".
+ */
+#include "CppWidgetApi.h"
+
+#include <cstdio>
+
+int CppWidget::virtualTick(int input)
+{
+	int result = input * 3;
+	std::printf("    CppWidget::virtualTick(%d) -> %d   [V2: input * 3, via vtable]\n", input, result);
+	return result;
+}
+
+int CppWidget::tick(int input)
+{
+	int result = input * 3;
+	std::printf("    CppWidget::tick(%d) -> %d   [V2: input * 3, via mangled-name lookup]\n", input, result);
+	return result;
+}
+
+CppWidget CppWidget::operator+(const CppWidget& /*other*/) const
+{
+	std::printf("    CppWidget::operator+   [V2]\n");
+	return CppWidget();
+}
+
+extern "C" CppWidget* make_cpp_widget()
+{
+	return new CppWidget();
+}

source/examples/HotReloadDemo/PluginV2/src/Plugin.cpp

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+/* PluginV2 -- "after your edit". See PluginV1/src/Plugin.cpp for
+ * "before". plugin_tick's behavior changed, plugin_legacy_feature was
+ * deleted, and plugin_new_feature was added -- exactly the three kinds
+ * of change hot_reload.h's HotReloadSymbolEvent enum distinguishes.
+ */
+#include "PluginApi.h"
+
+#include <cstdio>
+
+int plugin_tick(int input)
+{
+	int result = input * 3;
+	std::printf("    plugin_tick(%d) -> %d   [V2: input * 3]\n", input, result);
+	return result;
+}
+
+/* plugin_legacy_feature deliberately does not exist in V2 anymore. */
+
+int plugin_new_feature(int input)
+{
+	int result = input * 10;
+	std::printf("    plugin_new_feature(%d) -> %d   [V2: brand new]\n", input, result);
+	return result;
+}
+
+#if defined(__GNUC__) || defined(__clang__)
+int plugin_tiny_function(int input)
+{
+	return input + 2;
+}
+#endif
+
+int plugin_build_marker = 2;