Merge all backup scripts

[pothi]

So, in the end, the backup script should simply be called wp-backup or backup-wp with the following options...

wp-backup -d (or --database) (for db backups)
wp-backup --db --files (or) wp-backup --files --db (for full backups)
wp-backup (-f) --files --exclude-uploads (or --no-uploads or --without-uploads) (for partial backups)

wp-backup -l (or --local for local backups)
wp-backup -r (or --remote for remote backups) (or) wp-backup -o (for offline backups)

wp-backups -r -a aws_bucket_name (or --aws)
wp-backups -r -g gcp_bucket_name (or --gcp)