Adds support for more sophisticated argument lists and ruby blocks

[willfish]

What

• [x] Adds support for custom handlers which support more idiomatic/custom reverse joining behaviour
• [x] Adds support for blocks and do_blocks reverse joins
• [x] Adds more sophisticated support for ruby argument_lists
• [x] Extract ruby-specific-behaviour into a dedicated container file

Why

• I use this plugin and its predecessor a lot in some ruby projects I maintain
• I assumed you'd be okay with separate files for dedicated language support to avoid cluttering the standard implementation with custom handlers

[AckslD]

Hi @willfish! This looks nice, I'm been quite busy lately and haven't gotten around to this yet but it's on my todo :)

[willfish]

Hi @AckslD . No biggie, I'm using it in earnest at work just to see if I can't find any bugs. I've noticed a couple:

• blocks (basically anonymous functions you pass to methods) get removed when revjing on argument_lists of method calls with blocks attached
• revjing in a method chain works for everything but the first method argument_list

Thanks for putting this project together :pray:

[AckslD]

@willfish, sorry again for taking ages for this, I should have prioritised it higher. I think it looks good and would be happy to merge if you still would like to.

[willfish]

No worries @AckslD. I'll reopen this a bit later :pray:

[AckslD]

Great! Would you mind resolving the conflicts? :)