Showcase different emoji sizes in the sample

[vanniktech]

In the list of 'chat' messages Emojis should be displayed with the same size as the according text. In case there are multiple emojis sent without any text show them a bit bigger. And if there's only one Emoji sent show it with a big size (similarly to what Whatsapp & Slack does).

Also with this we could finally go and stabilize the API for setting the Emoji Size and for once and for all leave this issue behind.

In addition the API should be simple and not error-prone.