replace all instances of NULL with nullptr

src/messages/lazyloadedimage.cpp

@@ -20,7 +20,7 @@ namespace messages {
 
 LazyLoadedImage::LazyLoadedImage(const QString &url, qreal scale, const QString &name,
                                  const QString &tooltip, const QMargins &margin, bool isHat)
-    : _currentPixmap(NULL)
+    : _currentPixmap(nullptr)
     , _currentFrame(0)
     , _currentFrameOffset(0)
     , _url(url)

src/messages/lazyloadedimage.hpp

@@ -63,7 +63,7 @@ public:
 
     int getWidth() const
     {
-        if (_currentPixmap == NULL) {
+        if (_currentPixmap == nullptr) {
             return 16;
         }
         return _currentPixmap->width();
@@ -71,7 +71,7 @@ public:
 
     int getHeight() const
     {
-        if (_currentPixmap == NULL) {
+        if (_currentPixmap == nullptr) {
             return 16;
         }
         return _currentPixmap->height();

src/messages/word.cpp

@@ -22,7 +22,7 @@ Word::Word(LazyLoadedImage *image, Type type, const QString &copytext, const QSt
 // Text word
 Word::Word(const QString &text, Type type, const QColor &color, const QString &copytext,
            const QString &tooltip, const Link &link)
-    : _image(NULL)
+    : _image(nullptr)
     , _text(text)
     , _color(color)
     , _isImage(false)