update chyron, add agenda item and new chyron type

[reiterl]

Resolve #3655

Needs autoupdate service pull request: OpenSlides/openslides-autoupdate-service#935

[reiterl]

It doesn't include the new colors for the agenda item.

[Elblinator]

The needed colour picker still needs to be implemented in the backend: OpenSlides/openslides-backend#2437

[luisa-beerboom]

Backend in OpenSlides/openslides-backend#2451

[Elblinator]

• In projector edit dialog: please move the colour picker for chyron_background_color_2 below chyron_font_color

• New chyron: please hide comma when the speaker is not talking with a structure level:
  

• Please change the Toggle button to a Hide button

• If the chyron is already projected (in the current projector) and the projection dialog is opened again, then the correct radio-buttons and checkbox should be preselected (e.g. if the new chyron and the agenda item are already projected then the dialog should have these options preselected)

• If there is no current speaker then the chyron should be hidden

[reiterl]

I have done most points of the change request, unless the pre-configuration of the projection dialog.
I have no idea, how to fix this. I leave it to @bastianjoel

[Elblinator]

As discussed with @emanuelschuetze and @MSoeb:

UI-change:

• There should be no line between the two chyrons
• for new chyron and the agenda: line-height should be changed to 1.25
• for new chyron and the agenda: the chyrons should always have margin-right of 50px (the chyrons should not touch the end of the projector)
• only for the agenda: the font-size should be 24 (it was 28 before)
• only for the agenda: padding-right should be 18px (like padding-left is already)

Bugs:

• The Topic/Motion numbers are not being projected, only the titles; The numbers should be projected as well
• Activating the chyron on any projector Always activates the chyron on the reference projector; the chyron should only be activated of the projector which detail view we activate the chyron from
• Currently the chyron can only be activated in one combination at a time (e.g. new chyron and agenda item), activating the chyron in a different combination on a different projector deactivates the first combination; if possible can the different projections be independent from each other?

[reiterl]

@bastianjoel Please checkout my changes and continue there on Tuesday.

[bastianjoel]

Needs OpenSlides/openslides-backend#2464 now.