refactor: Make Account & Settings buttons SVGs (#6267)

instead of rendering the icons directly in Chatterino, they're now SVGs

This has the following consequences:
1. The color does _not_ respect your custom theme. For most users, this
   will not be a problem/concern.
2. You can no longer drag a split onto those buttons to create a new tab

src/widgets/Notebook.cpp

@@ -13,6 +13,7 @@
 #include "widgets/buttons/InitUpdateButton.hpp"
 #include "widgets/buttons/NotebookButton.hpp"
 #include "widgets/buttons/PixmapButton.hpp"
+#include "widgets/buttons/SvgButton.hpp"
 #include "widgets/dialogs/SettingsDialog.hpp"
 #include "widgets/helper/ChannelView.hpp"
 #include "widgets/helper/NotebookTab.hpp"
@@ -1407,7 +1408,12 @@ void SplitNotebook::showEvent(QShowEvent * /*event*/)
 void SplitNotebook::addCustomButtons()
 {
     // settings
-    auto *settingsBtn = this->addCustomButton<NotebookButton>();
+    auto *settingsBtn = this->addCustomButton<SvgButton>(SvgButton::Src{
+        .dark = ":/buttons/settings-darkMode.svg",
+        .light = ":/buttons/settings-lightMode.svg",
+    });
+
+    settingsBtn->setPadding({0, 0});
 
     // This is to ensure you can't lock yourself out of the settings
     if (getApp()->getArgs().safeMode)
@@ -1426,14 +1432,18 @@ void SplitNotebook::addCustomButtons()
             this->signalHolder_);
     }
 
-    settingsBtn->setIcon(NotebookButton::Settings);
-
-    QObject::connect(settingsBtn, &NotebookButton::leftClicked, [this] {
+    QObject::connect(settingsBtn, &Button::leftClicked, [this] {
         getApp()->getWindows()->showSettingsDialog(this);
     });
 
     // account
-    auto *userBtn = this->addCustomButton<NotebookButton>();
+    auto *userBtn = this->addCustomButton<SvgButton>(SvgButton::Src{
+        .dark = ":/buttons/account-darkMode.svg",
+        .light = ":/buttons/account-lightMode.svg",
+    });
+
+    userBtn->setPadding({0, 0});
+
     userBtn->setVisible(!getSettings()->hideUserButton.getValue());
     getSettings()->hideUserButton.connect(
         [userBtn](bool hide, auto) {
@@ -1441,8 +1451,7 @@ void SplitNotebook::addCustomButtons()
         },
         this->signalHolder_);
 
-    userBtn->setIcon(NotebookButton::User);
-    QObject::connect(userBtn, &NotebookButton::leftClicked, [this, userBtn] {
+    QObject::connect(userBtn, &Button::leftClicked, [this, userBtn] {
         getApp()->getWindows()->showAccountSelectPopup(
             this->mapToGlobal(userBtn->rect().bottomRight()));
     });

src/widgets/buttons/NotebookButton.cpp

@@ -89,48 +89,6 @@ void NotebookButton::paintContent(QPainter &painter)
         }
         break;
 
-        case User: {
-            painter.setRenderHint(QPainter::Antialiasing);
-
-            auto a = w / 8;
-            QPainterPath path;
-
-            path.arcMoveTo(a, 4 * a, 6 * a, 6 * a, 0);
-            path.arcTo(a, 4 * a, 6 * a, 6 * a, 0, 180);
-
-            QPainterPath remove;
-            remove.addEllipse(2 * a, 1 * a, 4 * a, 4 * a);
-            path = path.subtracted(remove);
-
-            path.addEllipse(2.5 * a, 1.5 * a, 3 * a, 3 * a);
-
-            painter.fillPath(path, foreground);
-        }
-        break;
-
-        case Settings: {
-            painter.setRenderHint(QPainter::Antialiasing);
-
-            auto a = w / 8;
-            QPainterPath path;
-
-            path.arcMoveTo(a, a, 6 * a, 6 * a, 0 - (360 / 32.0));
-
-            for (int i = 0; i < 8; i++)
-            {
-                path.arcTo(a, a, 6 * a, 6 * a, i * (360 / 8.0) - (360 / 32.0),
-                           (360 / 32.0));
-                path.arcTo(2 * a, 2 * a, 4 * a, 4 * a,
-                           i * (360 / 8.0) + (360 / 32.0), (360 / 32.0));
-            }
-
-            QPainterPath remove;
-            remove.addEllipse(3 * a, 3 * a, 2 * a, 2 * a);
-
-            painter.fillPath(path.subtracted(remove), foreground);
-        }
-        break;
-
         default:;
     }
 }

src/widgets/buttons/NotebookButton.hpp

@@ -13,7 +13,10 @@ class NotebookButton : public Button
     Q_OBJECT
 
 public:
-    enum Icon { None, Plus, User, Settings };
+    enum Icon {
+        None,
+        Plus,
+    };
 
     explicit NotebookButton(Notebook *parent);