Development version 0.5.2.3

* Added changelog history
* Enabled changing of Mount and Startup
options also when virtualbox is running - They impact only during plugin
start
* Only if VirtualBox installed give option to update from local or
online versions if exist otherwise download options
* Changed
"vboxmanage" to correct case "VBoxManage" and added full path
"/opt/Virtualbox/VBoxManage"
* Added to log confirmation that
installation of packages completed correctly.
* If "VirtualBox LOCAL
version different than INSTALLED version" then function changed to
"update" instead of "install"