Add internal and external references to SemTiSa
Add new link macro for AEG. Upgrade to https for gesetze-im-internet.de as the websites seems to be in https. Used hyperref for link to par:3-1 as this label doesn't exist. Probalby an error, as § 3 (1) doesn't make sense (§ 1 (3) on the other hand would make sense). Used link in footnote for SGB IX as the links to part and chapters are not very semantic at gesetze-im-internet.de. Add new PDF with all references.