Improve agenda and poll detail pdf

[emanuelschuetze]

Agenda pdf:

• use nowrap in identifier column
• move identifier of subitems in title column
• remove "Table of contents" h2 title

Poll detail pdf:

• use nowrap in index column
• reduce column width of vote-weight and has-voted
• use getFullName instead getShortName in user tables

[bastianjoel]

Might be a good idea to create an issue for the poll related changes and add it to the list in #6152. Otherwise your changes are likely to be dropped after the new vote service.

[Elblinator]

please also create issue

[Elblinator]

Suggested change

	level?: number;
	isTopicSubitem?: boolean;