Add the restore command to the interface

Signed-off-by: Paul de Wouters <paul@hmn.md>
Add restore functionality to interface

Signed-off-by: Paul de Wouters <paul@hmn.md>
first pass at restore class

Signed-off-by: Paul de Wouters <paul@hmn.md>
Remove unnecessary directory sep

Signed-off-by: Paul de Wouters <paul@hmn.md>
Refactored the class

Signed-off-by: Paul de Wouters <paul@hmn.md>
fixed merge conflicts

Signed-off-by: Paul de Wouters <paul@hmn.md>
Fix check for existing backup archive

Signed-off-by: Paul de Wouters <paul@hmn.md>
Merge branch 'feature/471-restore-db-shell' into feature/473-restore-full-backup

Signed-off-by: Paul de Wouters <paul@hmn.md>

Conflicts:
	admin/actions.php
	classes/class-hmbkp-db-restore.php
	classes/wp-cli.php
delete unneeded statement

Signed-off-by: Paul de Wouters <paul@hmn.md>