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/messages/messagebuilder.cpp

@@ -33,17 +33,21 @@ void MessageBuilder::appendTimestamp(time_t time)
 {
     char timeStampBuffer[69];
 
+    // TODO(pajlada): Fix this
+    QColor systemMessageColor(140, 127, 127);
+    // QColor &systemMessageColor = ColorScheme::getInstance().SystemMessageColor;
+
     // Add word for timestamp with no seconds
     strftime(timeStampBuffer, 69, "%H:%M", localtime(&time));
     QString timestampNoSeconds(timeStampBuffer);
-    appendWord(Word(timestampNoSeconds, Word::TimestampNoSeconds,
-                    ColorScheme::getInstance().SystemMessageColor, QString(), QString()));
+    appendWord(Word(timestampNoSeconds, Word::TimestampNoSeconds, systemMessageColor, QString(),
+                    QString()));
 
     // Add word for timestamp with seconds
     strftime(timeStampBuffer, 69, "%H:%M:%S", localtime(&time));
     QString timestampWithSeconds(timeStampBuffer);
-    appendWord(Word(timestampWithSeconds, Word::TimestampWithSeconds,
-                    ColorScheme::getInstance().SystemMessageColor, QString(), QString()));
+    appendWord(Word(timestampWithSeconds, Word::TimestampWithSeconds, systemMessageColor, QString(),
+                    QString()));
 }
 
 QString MessageBuilder::matchLink(const QString &string)