Rework Glossaries

• functions.tex: Fehler: 52: Undefined control sequence. \newglossarystyle
• functions.tex: Fehler: 52: Missing $ inserted. \newglossarystyle{symbols_
• functions.tex: Fehler: 52: Extra }, or forgotten $. \newglossarystyle{symbols_style}
• functions.tex: Fehler: 53: Undefined control sequence. \setglossarystyle
• functions.tex: Fehler: 54: Environment theglossary undefined. \renewenvironment{theglossary}
• functions.tex: Fehler: 57: Command \glossentry undefined. \renewcommand*{\glossentry}
• functions.tex: Fehler: 65: Missing $ inserted.
• functions.tex: Fehler: 84: Undefined control sequence. \newglossarystyle
• functions.tex: Fehler: 84: Missing $ inserted. \newglossarystyle{glossary_
• functions.tex: Fehler: 84: Extra }, or forgotten $. \newglossarystyle{glossary_style}
• functions.tex: Fehler: 85: Undefined control sequence. \setglossarystyle
• functions.tex: Fehler: 86: Environment theglossary undefined. \renewenvironment{theglossary}
• functions.tex: Fehler: 89: Command \glossentry undefined. \renewcommand*{\glossentry}
• functions.tex: Fehler: 97: Missing $ inserted.
• main.tex: Fehler: 45: File `glossary.tex' not found. \input{glossary}