Implemented a new, better looking tooltip. (#158)

* Implemented a new, better looking tooltip.

* Pajlada fix.

* Fixed dragging behaving incorrectly.

* Fixed out of focus hovering getting stuck.

src/widgets/tooltipwidget.cpp

@@ -0,0 +1,52 @@
+#include "tooltipwidget.hpp"
+#include "colorscheme.hpp"
+#include "fontmanager.hpp"
+
+#include <QStyle>
+#include <QVBoxLayout>
+
+namespace chatterino {
+namespace widgets {
+
+TooltipWidget::TooltipWidget(BaseWidget *parent)
+    : BaseWidget(parent)
+    , displayText(new QLabel())
+{
+    QColor black(0,0,0);
+    QColor white(255,255,255);
+
+    QPalette palette;
+    palette.setColor(QPalette::WindowText,white);
+    palette.setColor(QPalette::Background,black);
+    this->setPalette(palette);
+    this->setWindowOpacity(0.8);
+    this->setFont(FontManager::getInstance().getFont(FontManager::Type::MediumSmall));
+
+    this->setAttribute(Qt::WA_ShowWithoutActivating);
+    this->setWindowFlags(Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint);
+
+    displayText->setAlignment(Qt::AlignHCenter);
+    auto layout = new QVBoxLayout();
+    layout->setContentsMargins(10,5,10,5);
+    layout->addWidget(displayText);
+    this->setLayout(layout);
+
+    FontManager::getInstance().fontChanged.connect([this] {
+        this->setFont(FontManager::getInstance().getFont(FontManager::Type::MediumSmall));
+    });
+}
+
+void TooltipWidget::setText(QString text)
+{
+    this->displayText->setText(text);
+}
+
+void TooltipWidget::moveTo(QPoint point)
+{
+    point.rx() += 16;
+    point.ry() += 16;
+    this->move(point);
+}
+
+}  // namespace widgets
+}  // namespace chatterino