Add menu point to scroll chat to bottom

[rebootl]

Since i sometimes get a lot of messages from my IRC bouncer, the loading takes some time and then i need an easy way to scroll down.

Probably only useful in my special use case. Leaving it here since it may be useful for someone.

Also not sure about the code cause i have no experience on Android.

[MCMrARM]

Hello and sorry for the delayed reploy,

If you make this a setting (off by default), I'll merge this.

The way I did this in message view v2 was to add a small down arrow in bottom right corner that shows if you scroll up (similar to many other apps). You can find the code for this here:
https://github.com/MCMrARM/revolution-irc/blob/newui/app/src/main/res/layout/chat_messages_fragment.xml#L56-L62
https://github.com/MCMrARM/revolution-irc/blob/newui/app/src/main/java/io/mrarm/irc/view/JumpToRecentButton.java
If you like this idea, you can convert your code to do this instead, otherwise an option will suffice.

[celeron55]

Uh, how is using a bouncer on a large channel a special use case? I'm having this problem also. It's a weird problem to have on an otherwise well polished application.

[rebootl]

Hi,
thanks for your feedback :)
Sorry this has been open for a long time, I may be able to find some time and make the changes so that this can merged, it may take some time though...