[Lazarus] New application type: HTTP standalone server

[Michael Van Canneyt]

Hi,

In revision 31011 I committed support for a HTTP server application in Lazarus, 
in the lazwebextra package. This is similar in functionality to the embweb package 
by Joost, but it does not use any external packages: you only need the latest FPC 
for this (at least rev. 17633).

It has an option to be able to serve regular files out-of-the-box. This is
implemented as a regular fpWeb HTTP module, which simply sends a file if it 
finds it. This module is implemented in a (new) unit fpwebfile. 
It works similar to the Apache server's Alias directive:
  RegisterFileLocation('files','/some/existing/directory');
will map /files/index.html to /some/existing/directory/index.html and send it.
Multiple locations can be registered.
if a mime.types file is present, the correct content-type is sent.

The FPC packages/fcl-web/examples/httpapp directory contains an example of how to use all this.

This means that FPC can now be used out of the box to implement web applications/pages
as
- CGI.
- FastCGI.
- Apache module.
- Standalone webserver.
IIS ISAPI support is planned.

Comments/suggestions welcome.

Michael.