Simplify access to data syntax and Roda rendering

[jaredcwhite]

After writing data.xyz a zillion times, you start to wonder if you can just write xyz. 😂

And in the continuing saga of questioning boilerplate, I wondered if I could get rid of render_with {} (which works due to copying local block variables down to the template) while at it.

So this is now possible in a dynamic Roda route:

---<%
name = "World"
%>---

Hello <%= name %>

Nice! 😌

Of course this will still work equally well:

---<%
render_with do
  name "World"
end
%>---

Hello <%= name %>

And regular front matter in static resources:

---
title: My Page
---

# <%= title %>

For folks who for whatever reason don't like this simplified syntax, the support_data_as_view_methods option can be set to false in the Bridgetown config, and then data.foo syntax is still mandatory.

---

For the Ruby nerds out there, the previous instance_eval code I'd written turned out to have a very strange side effect: even though the procs are eventually executed in the context of a Roda app instance, any modules/classes defined would actually be attached to the singleton class of Bridgetown::Routes::CodeBlocks. Weird, right? The likelihood of a file-based route needing to define a standalone module/class is low, but if it's supported it might as well work like any standard Ruby file being required at runtime. So I switched it up to use Kernel.eval and TOPLEVEL_BINDING instead of Bridgetown::Routes::CodeBlocks.instance_eval. Works! 😅

Also I finally got proper line number error reporting working as expected. This has been an ongoing frustration…turns out part of the reason why this has been inconsistent is our front matter regexps were swallowing a variable amount of newlines as whitespace around the template boundaries via \s. Changing that to [ \t] resolves the issue, and then calling lstrip restores the previous whitespace behavior after regexp parsing.

[render]

Your Render PR Server URL is https://bridgetown-beta-pr-890.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-conc9een7f5s73b4g0r0.

[render]

Your Render PR Server URL is https://bridgetown-api-pr-890.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-conc9emn7f5s73b4g110.