Qcommandlineparser (#199)

* Replaced getoptplusplus with QCommandLineParser. Fixes #39

* enabling C++11 if possible

* enabling C++11 if possible

* fixed gcc compilation issues

* fixed linux builds and improved os x build

* trying to fix dispmanx

* trying to fix dispmanx

* simplified travis build script

* fixed argumentparser default values

* rewrote validator system and made sure default arguments are processed correctly

* rewrote validator system and made sure default arguments are processed correctly

* fixed bool vs. regular options

* oops... removing debug code

* reverted screenshot api change

libsrc/commandline/ColorOption.cpp

@@ -0,0 +1,30 @@
+#include <QRegularExpression>
+#include "commandline/ColorOption.h"
+#include "commandline/Parser.h"
+
+using namespace commandline;
+
+bool ColorOption::validate(Parser & parser, QString & value)
+{
+    // Check if we can create the color by name
+    _color = QColor(value);
+    if (_color.isValid()) {
+        return true;
+    }
+
+    // check if we can create the color by hex RRGGBB getColors
+    _color = QColor(QString("#%1").arg(value));
+    if (_color.isValid()) {
+        return true;
+    }
+
+    if(!parser.isSet(*this)){
+        // Return true if no value is available
+        return true;
+    }
+
+    QStringList error;
+    _error = QString("Invalid color. A color is specified by a six lettered RRGGBB hex getColors or one of the following names:\n\t- %1").arg(QColor::colorNames().join("\n\t- "));
+
+    return false;
+}