mod_lua: Redesign the table construction/access mechanism, so we pass on a struct with the request_rec, the table pointer and the table name instead of just the table pointer. This allows us to use the request_rec for logging/editing purposes, as well as inform the user which exact table in the request_rec was modified.

Remove unneeded exports from mod_lua.

Removed non-existent funcion from header.

mod_lua: Add a lot of core httpd/apr functionality to mod_lua (such as regex matching, expr evaluation, changing/fetching server configuration/info - see docs for a complete list). This also includes a bunch of automatically scraped functions, which may or may not be super useful. Comments appreciated as always, especially on the more hacky bits.

fix symbol space and exports

changes headers_in and headers_out handling in mod_lua to map apr_table_t instances as boxed pointers

Reformat mod_lua according to the HTTP Server Project C Style Guide: <http://httpd.apache.org/dev/styleguide.html> No functional changes.

Include standard ASF license block.

Rename all files in mod_lua to have a lua_ prefix, as things like 'config.h' are way to generic and will often conflict with other include files.