#53 Explorer panel enhancements

[andreoneakanif]

Here some suggestions to make this panel more powerful:

- when right-clicking on a file and folder, add an option to locate the file into an explorer or browse the current folder
- add an option into the preference or a new option into the contextual menu to toggle hidden files view
- use shell features: use the shell icon for folders and allow to show the shell menu on right-click
This would be a killer feature when using TortoiseSvn :)