A lot of changes

Remove unused constructor of messages::Message
Fixed LimitedQueueSnapshot _-prefixes
Changed LimitedQueueSnapshot's usage of int to std::size_t
ColorScheme is no longer a singleton
Created a "BaseWidget" class which is pretty much a QWidget except it
has a reference of ColorScheme since most widgets will need a reference
to the style they should use.
BaseWidget can be implemented either with a BaseWidget parent (which
will copy the ColorScheme reference from the parent) or with a
normal QWidget parent and an explicit ColorScheme reference.
Save main window geometry on close
Fix font changing in the Settings Dialog
Update settings library version

src/widgets/scrollbarhighlight.hpp

@@ -3,43 +3,50 @@
 #include "QString"
 
 namespace chatterino {
+
+class ColorScheme;
+
 namespace widgets {
 
+class ScrollBar;
+
 class ScrollBarHighlight
 {
 public:
     enum Style { Default, Left, Right, SingleLine };
 
-    ScrollBarHighlight(float getPosition, int getColorIndex, Style getStyle = Default,
+    ScrollBarHighlight(double _position, int _colorIndex, ScrollBar *parent, Style _style = Default,
                        QString _tag = "");
 
-    Style getStyle()
-    {
-        return _style;
-    }
+    ColorScheme &colorScheme;
 
-    float getPosition()
+    double getPosition()
     {
-        return _position;
+        return this->position;
     }
 
     int getColorIndex()
     {
-        return _colorIndex;
+        return this->colorIndex;
+    }
+
+    Style getStyle()
+    {
+        return this->style;
     }
 
     QString getTag()
     {
-        return _tag;
+        return this->tag;
     }
 
     ScrollBarHighlight *next = nullptr;
 
 private:
-    Style _style;
-    float _position;
-    int _colorIndex;
-    QString _tag;
+    double position;
+    int colorIndex;
+    Style style;
+    QString tag;
 };
 
 }  // namespace widgets