Add base class for output
Initial Apache module complete!
- New wpl_io class which replaces old ostream-methods
- When outputting from TEXT or HTML_TEMPLATE, Apache directly uses the memory allocated when the file was loaded from disk
- Fix in JSON output which now uses the new (and faster) buffer wpl_io_buffer
- wpl_parser had a static includes counter which failed when running in apache. Replaced with a recursive method
- Added Apache 2.0 licence to the Apache module