Remove appbase as an external dependency.

lib/appbase/util/FuzzyConvert.cpp

@@ -0,0 +1,33 @@
+#include "FuzzyConvert.hpp"
+
+#include <QRegularExpression>
+
+namespace chatterino {
+
+int fuzzyToInt(const QString &str, int default_)
+{
+    static auto intFinder = QRegularExpression("[0-9]+");
+
+    auto match = intFinder.match(str);
+    if (match.hasMatch())
+    {
+        return match.captured().toInt();
+    }
+
+    return default_;
+}
+
+float fuzzyToFloat(const QString &str, float default_)
+{
+    static auto floatFinder = QRegularExpression("[0-9]+(\\.[0-9]+)?");
+
+    auto match = floatFinder.match(str);
+    if (match.hasMatch())
+    {
+        return match.captured().toFloat();
+    }
+
+    return default_;
+}
+
+}  // namespace chatterino