Oer dizze útwreiding

Features in soimon's version of this Add-on:
- Event names containing a colon (:) will have the part before the colon being displayed as a colored tag that helps discerning different kinds of events without the need for creating dozens of calendars.
  For example: "Tag: Event name" becomes "[Tag] Event name".
- Event names ending with a question mark will be displayed in italic and transparent, as a kind of optional or yet to be confirmed event.
New features, always talking about text in event names:
- Parts of the text wrapped in a wave dash (~) will be crossed (with a line through).
- Parts of the text wrapped in double asterisks (**) will be bold.
- Parts of the text wrapped in double hyphens (--) will be in a tag like in the original version, but with a red background and a white text.
- Parts of the text wrapped in double points (..) will be in a tag like in the original version, but with a black background and a white text.

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