Add UI to manage video conferencing

[friedger]

Users should be able

• to add a new video conference to a new or existing event
• to remove a video conference of an existing event
• to be able to join a video conference of an event from the event details

This requires

• to change the event details
  * add small button to add, add a link to join, add small button to remove matrix room)
  * add progress animation while creating, deleting a new room

• to add tests for storing events checking that video conference property of events are stored correctly

The actions for creating and removing a room are handled in a different issue.
The dummy action for creating a room should just return always https://chat.openintents.org/#/room/#oi-calendar:openintents.modular.im
The dummy action for deleting a room should just write a message in the console.

Google Calendar implemented this as a drop down:

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[friedger]

@iamonuwa Did you checkout the project? Do you have already a blockstack ID? Feel free to join at https://chat.openintents.org/#/room/#oi-calendar:openintents.modular.im

[iamonuwa]

Yes, I've checkout the project. Going through it locally. Joining now

[leonardohofling]

@friedger #64

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Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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Work for 0.833 ETH (102.34 USD @ $122.86/ETH) has been submitted by:

1. @leonardohof

@friedger please take a look at the submitted work:

• PR by @leonardohof

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Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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The funding of 0.833 ETH (102.27 USD @ $122.77/ETH) attached to this issue has been approved & issued to @leonardohof.

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[friedger]

fixed by #64