nixos/lighttpd: add services.lighttpd.enableModules option

This option makes the coupling between lighttpd and its sub-services
more "loose".

While the option is a list, its purpose is to provide a "set" of needed
modules to load for lighttpd to function correctly with its config. The
NixOS lighttpd module ensures that lighttpd modules are loaded no more
than once (because lighttpd dislikes that), and in the correct order.

Also add an assertion that all modules listed in .enableModules are
valid.
fix fetchurl
qtcreator: Update from 3.1.0 to 3.2.0
haskellPackages.diagramsGtk: New expression
haskellPackages.engineIo: Update to 1.2.0
haskellPackages.engineIoSnap: Update to 1.0.2
haskellPackages.socketIo: Update to 1.1.1
blender: Update to 2.72
gtk-doc: update from 1.18 to 1.21 and add meta information
CompCert: update to 2.4
Update muPDF
Only update via external upstream information: nead to specify version format
Update sysdig
Update firejail
Fix the version
Update sodium to 1.0.0
Update SCons
Update Wine unstable
Add Linux 3.17
Update linux_latest reference to 3.17