added isActiveProfile function and fixed a typo

src/core/toxid.cpp

@@ -1,5 +1,7 @@
 #include "toxid.h"
 
+#include "core.h"
+
 #include <tox/tox.h>
 #include <qregularexpression.h>
 
@@ -40,6 +42,11 @@ bool ToxId::operator!=(const ToxId &other) const
     return publicKey != other.publicKey;
 }
 
+bool ToxId::isActiveProfile() const
+{
+    return *this == Core::getInstance()->getSelfId();
+}
+
 QString ToxId::toString() const
 {
     return publicKey + noSpam + checkSum;

src/core/toxid.h

@@ -13,11 +13,13 @@ public:
     ToxId(); ///< The default constructor. Creates an empty Tox ID.
     ToxId(const ToxId& other); ///< The copy constructor.
     ToxId(const QString& id); ///< Create a Tox ID from QString.
-                              /// If the given id is not a valid Tox ID, than
+                              /// If the given id is not a valid Tox ID, then:
                               /// publicKey == id and noSpam == "" == checkSum.
 
     bool operator==(const ToxId& other) const; ///< Compares only publicKey.
     bool operator!=(const ToxId& other) const; ///< Compares only publicKey.
+    bool isActiveProfile() const; ///< Returns true if this Tox ID is equals to
+                                  /// the Tox ID of the currently active profile.
     QString toString() const; ///< Returns the Tox ID as QString.
     void clear(); ///< Clears all elements of the Tox ID.