Symbol display of calendar events

Add rule based options to represent any calendar entry by an icon. Use icon packs to choose how the symbol will look like.

Explanation:

Images tell more than a thousand words. So using rules to detect what image shall be associated with a calendar event makes them digestible more easily.

For example when an even contains the word "party" then a rule would associate the symbol for a party (user selected) with this event. The selected symbol will be display either exclusively for the event in a compact view of be added in front of the event in normal calendar views.

I could image displaying all events with symbols in a "symbol calendar" widget with an editable time span.

There shall be rules which use matching options to detect what kind of event each given calendar entry is.

Multiple of the following options should be used to detect / match events:

- contains word / does not contain word

- contains regex expression / does not contain regex expression

- exactly matches phrase / does not match phrase

There should be a order / priority of matching rules. The first matching rule select the symbol for an event. This allows fallback to other symbols and overrides to such general rules.

With symbols the are selected using matching rules a calendar could become quickly scannable and events look less boring.