Modernize Block for Current Best Practices

Modernize block for current best practices

- Change edit.php and add.php to use `$this->inc()` method
- Remove unneeded variables
- Add `public` decalation to methods
- Convert short tage
- Remove closing `?>` at end of file
- Whitespace
Set `$form` for `view()`
Merge pull request #2 from concrete5/update_form_cleanup_and_modernization

Update form cleanup and modernization