Use HTML description

[niccokunzmann]

There seem to be different descriptions avaliable, some in HTML:

In case such an alternative, understood description is avaliable, we should use it to make it look better!

Examples

X-ALT-DESC;FMTTYPE=text/html:

from: food.ics

DESCRIPTION;ALTREP="data:text/html,%3Ch1%3EKnow%20This%20Heading!%3C%2Fh1%3
 E%3Cbr%3EPlease%20have%20a%20look%20at%20this%20website%3A%3Cbr%3E%3Ca%20hr
 ef%3D%22https%3A%2F%2Fopen-web-calendar.quelltext.eu%2Ftemplates%2F%22%3EEx
 amples%3C%2Fa%3E%3Cbr%3E%F0%9F%99%82%3Col%3E%3Cli%3Eone%3C%2Fli%3E%3Cli%3Et
 wo%3C%2Fli%3E%3C%2Fol%3EAnd%20consider%20this%3A%3Cul%3E%3Cli%3Ea%20bullet%
 20point%3C%2Fli%3E%3Cli%3Eand%20another%20bullet%20point%3C%2Fli%3E%3C%2Ful
 %3E%3Cp%3E%3Cb%3Ebold%3C%2Fb%3E%2C%20%3Cu%3Eunderlined%3C%2Fu%3E%20and%20%3
 Ci%3Eitalic%3C%2Fi%3E%20work!%3C%2Fp%3E%3Cpre%3Ecode%3Cbr%3Ecode%3Cbr%3Ecod
 e%3C%2Fpre%3E":Know This Heading!\n\nPlease have a look at this website:\nE
 xamples\n🙂\n\n    one\n    two\n\nAnd consider this:\n\n    a bullet poi
 nt\n    and another bullet point\n\nbold\, underlined and italic work!\n\nc
 ode\ncode\ncode

from event from thunderbird

Related

See #173.

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