Introduce dependency for fonts-crosextra-carlito

[Uncle Scrooge]

The plain ISO of Kubuntu 20.10 install LibreOffice without the package fonts-crosextra-carlito.

This causes problems for people which use LibreOffice to open files created with Microsoft Office, due to the missing font.

Microsoft Office uses the "Calibri" font, which under the vanilla installation of Kubuntu 20.10, is substituted by fontconfig with "Noto Sans", an improper substitution since "Noto Sans" is not metric-compatible with "Calibtri".

Substituting it with "Carlito" is much better. "Carlito" is a drop-in replacement for "Calibri", as the package description of "Carlito" shows: "Sans-serif font metric-compatible with Calibri font".

Carlito is a very small package. Its installed size is 2.836 kB.

If this package is not provided, when LibreOffice opens a document created with Microsoft Office, the layout of the document is all messed up, and LibreOffice and does provide an explanation for it (LibreOffice does not issue any warning for missing fonts, it just displays the font name in italics, which is still cryptic for a new comer). If this package is provided, instead, there are no problems opening MIcrosoft Office file.

I suggest making Carlito a dependency of the libreoffice package. Maybe also the other fonts-crosextra* packages.

See: https://bugs.documentfoundation.org/show_bug.cgi?id=138923

See: https://askubuntu.com/questions/1300334/missing-fonts-cause-libreoffice-impress-to-mess-up-the-layout-of-the-slides

See: https://bugs.launchpad.net/ubuntu/+source/fonts-crosextra-carlito/+bug/1908477