GH-378 add a resource search path to custom themes

This allows adding images and other bits and pieces to themes.

application/MultiMC.cpp

@@ -1027,6 +1027,7 @@ void MultiMC::setApplicationTheme(const QString& name)
 		auto & theme = (*themeIter).second;
 		setStyle(QStyleFactory::create(theme->qtTheme()));
 		setPalette(theme->colorScheme());
+		QDir::setSearchPaths("theme", theme->searchPaths());
 		setStyleSheet(theme->appStyleSheet());
 	}
 	else

application/themes/CustomTheme.cpp

@@ -128,10 +128,11 @@ CustomTheme::CustomTheme(ITheme* baseTheme, QString folder)
 {
 	m_id = folder;
 	QString path = FS::PathCombine("themes", m_id);
+	QString pathResources = FS::PathCombine("themes", m_id, "resources");
 
 	qDebug() << "Loading theme" << m_id;
 
-	if(!FS::ensureFolderPathExists(path))
+	if(!FS::ensureFolderPathExists(path) || !FS::ensureFolderPathExists(pathResources))
 	{
 		qWarning() << "couldn't create folder for theme!";
 		m_palette = baseTheme->colorScheme();
@@ -191,6 +192,12 @@ CustomTheme::CustomTheme(ITheme* baseTheme, QString folder)
 	}
 }
 
+QStringList CustomTheme::searchPaths()
+{
+	return { FS::PathCombine("themes", m_id, "resources") };
+}
+
+
 QString CustomTheme::id()
 {
 	return m_id;

application/themes/CustomTheme.h

@@ -15,6 +15,7 @@ public:
 	double fadeAmount() override;
 	QColor fadeColor() override;
 	QString qtTheme() override;
+	QStringList searchPaths() override;
 
 private: /* data */
 	QPalette m_palette;

application/themes/ITheme.h

@@ -13,6 +13,10 @@ public:
 	virtual QPalette colorScheme() = 0;
 	virtual QColor fadeColor() = 0;
 	virtual double fadeAmount() = 0;
+	virtual QStringList searchPaths()
+	{
+		return {};
+	}
 
 	static QPalette fadeInactive(QPalette in, qreal bias, QColor color);
 };