refactor: some more Application refactors (#5551)

mocks/include/mocks/BaseApplication.hpp

@@ -4,7 +4,9 @@
 #include "mocks/DisabledStreamerMode.hpp"
 #include "mocks/EmptyApplication.hpp"
 #include "providers/bttv/BttvLiveUpdates.hpp"
+#include "singletons/Fonts.hpp"
 #include "singletons/Settings.hpp"
+#include "singletons/Theme.hpp"
 
 #include <QString>
 
@@ -18,12 +20,16 @@ class BaseApplication : public EmptyApplication
 public:
     BaseApplication()
         : settings(this->args, this->settingsDir.path())
+        , theme(this->paths_)
+        , fonts(this->settings)
     {
     }
 
     explicit BaseApplication(const QString &settingsData)
         : EmptyApplication(settingsData)
         , settings(this->args, this->settingsDir.path())
+        , theme(this->paths_)
+        , fonts(this->settings)
     {
     }
 
@@ -32,6 +38,16 @@ public:
         return &this->streamerMode;
     }
 
+    Theme *getThemes() override
+    {
+        return &this->theme;
+    }
+
+    Fonts *getFonts() override
+    {
+        return &this->fonts;
+    }
+
     BttvLiveUpdates *getBttvLiveUpdates() override
     {
         return nullptr;
@@ -45,6 +61,8 @@ public:
     Args args;
     Settings settings;
     DisabledStreamerMode streamerMode;
+    Theme theme;
+    Fonts fonts;
 };
 
 }  // namespace chatterino::mock