Update htaccess to grant access on Apache 2.4

With the release off Contao 3.0.6 the htaccess files were updated. Actually the mcw and any extension who used it would be broken on apache 2.4. 

More informations https://github.com/contao/core/issues/5032
Merge pull request #119 from may17/patch-3

Update htaccess to grant access on Apache 2.4
Do not hard coded load class files in Contao 3.X but use the autoloader
instead.
Merge pull request #124 from discordier/dev

Do not hard coded load class files in Contao 3.X but use the autoloader instead.