* On Windows FileOps::removeFile() fails for updater.exe
since that file is in use by the current process.
Whilst it is not possible to remove the file whilst it
is in use, it can be moved or scheduled for deletion on reboot.
This commit changes FilesOps::removeFile() to simulate the
behavior of unlink() on Linux by moving in-use files to
a temporary directory and then scheduling for them to
be removed on restart.
* Add FileOps::fileName() to get the base name for a file
* Add ProcessUtils::runSync() to run a process, wait for it to exit and then
return the status code from that process.
* Change ProcessUtils::runAsyncUnix() to use execvp() in order to search PATH
for the specified binary if the filename is not absolute.
