Implement BDirTools::appendFile and BDirTools::appendTextFile functions
Fix plugin activation
Merging with develop
Implement new BeQt functions

* Implement BeQt::takeOwnership function
* Implement BeQt::deleteUnowned function
* Implement BeQt::deleteLaterUnowned function
Implement new BDirTools functions

* Implement BDirTools::appendFile function
* Implement BDirTools::appendTextFile function
Implement new BeQt functions

* Implement BeQt::takeOwnership function
* Implement BeQt::deleteUnowned function
* Implement BeQt::deleteLaterUnowned function
Update TODO
Add BPasswordGroup and BEditGroup classes
Add BPasswordGroup and BEditGroup classes
Update TODO
Add BLoginWidget class
Add BLoginWidget class
Update TODO
Add custom BAboutDialog tabs
Add custom BAboutDialog tabs
Update TODO
Add new BPluginWrapper static methods

Implement accessing parent BPluginWrapper from plugin instance
Implement new BPluginWrapper static methods

Implement accessing parent BPluginWrapper from plugin instance
Fix BCoreApplication and BPluginWrapper

Fix static BPluginWrapper::settings and BPluginWrapper::parentWrapper methods.
Fix registered plugins and translators unloading on BCoreApplication deletion.
Add BImageWidget class

Add BImageWidget class for displaying any type of images (particularly GIF)