ui: diverse improvements before release

* hide build file content
* use small buttons in all windows
* new design for start screen
* fixed design for enter license ui
* added spacing to summary
* brighter icons in wizzard
* added template icon for graph
* smoothing for graph icons
* switched error icon to dot
* fixed error message tooltip immediatly disappearing
* menu item for opening documentation

src/lib_gui/qt/window/QtMainWindow.cpp

@@ -2,6 +2,7 @@
 
 #include <QApplication>
 #include <QFileDialog>
+#include <QDesktopServices>
 #include <QDockWidget>
 #include <QMenuBar>
 #include <QMessageBox>
@@ -308,6 +309,11 @@ void QtMainWindow::openSettings()
 	wizzard->showPreferences();
 }
 
+void QtMainWindow::showDocumentation()
+{
+	QDesktopServices::openUrl(QUrl("https://coati.io/documentation/"));
+}
+
 QtSettingsWindow* QtMainWindow::showLicenses()
 {
 	QtAboutLicense* licenseWindow = new QtAboutLicense(this);
@@ -624,6 +630,7 @@ void QtMainWindow::setupHelpMenu()
 	menuBar()->addMenu(menu);
 
 	menu->addAction(tr("&About"), this, SLOT(about()));
+	menu->addAction(tr("Documentation"), this, SLOT(showDocumentation()));
 	menu->addAction(tr("Licences"), this, SLOT(showLicenses()));
 
 	if(!isTrial())