Inline pdf attachment export for motions

[bastianjoel]

resolves #4798
closes #5274

[MSoeb]

Please make the changes:

If "Include..." is clicked:

• Page layout options Table of contents, Continous Text should be deactivated. (I think, the other options hsould work even with pdf file export.)

• Header and footer: Page numbers should be deactivated. Header and current date for the normal motion pdfs should stay.

• Option for "Include" should only be available, if a PDF file is attached to a selected motion. (Follows logic of other options)

• Option "include" should not be a default selection. (If this currently integrated ignore this point.)

Term changes:

• Attachments --> Attachments (URL)
• Include.. -> Attachments (PDF embedded)

Other problems which can, if possible should be solved:

• Voting result: Should only be available, if a selected motion have one. If available, not preselected, but open for selection. If not, not possible to select.
• Change of text version: the text option in content is deselected, if text version is changed. -> Text should stay selected.

For the record:
Other problems which we have seems to solved with this PR.

• Options which are not available in a motion are correctly not choosable. (Supporters, Motion editors, speaker, recommendation, Category, Tags, Motions block, linked motions). In the live version these options are correctly not choosable, but the visual set them nevertheless as chosen and preselected.

[bastianjoel]

Option for "Include" should only be available, if a PDF file is attached to a selected motion. (Follows logic of other options)

We do not load all attachment data on the motion list. Therefore this is now only disabled when there are no attachments at all.

[MSoeb]

• Export dialog: If a motion doesn't contain an attachment, the export dialog still shows the marked option, even it is not choosable anymore.

--> Wanted: All options which are currently not available for export should be in the visual scheme of the Attachments (URL) button. See image below.

[Elblinator]

We talked about this behaviour a bit:

1. The chips remember their state in between meetings in general and this should be fixed in it's own issue
2. The disabled but selected chips maybe should not have the blue checkbox and should stay as there are right now, this will be discussed a bit more and will be probably fixed in the issue mentioned above
3. @MSoeb will think a bit more about the functionality here and if the chip should be selected or not if it's impossible to export pdfs

Conlcusion:

1. A new issue will be created
2. No further coding is needed until @MSoeb says how the client should behave here

[MSoeb]

The snackbar currently flickers, display multiple times and shows quite late the info that a PDF is exported.

Wanted: Only one snackbar with the pdf export text should be shown.

[Elblinator]

code

[MSoeb]

Flickering of snackback during export with attachments happens still.

[bastianjoel]

Flickering of snackback during export with attachments happens still.

But it should be minor now. IMHO the effort needed to fix this is not worth it.

[Elblinator]

code