Add Dancer2::Manual::Migration

[racke]

We need migration docs for moving Dancer apps, plugins and engines from Dancer1 to Dancer2.

Please dump all information into this issue, I'll compile it in a POD later.

Regards
Racke

[racke]

forward instead of request->path_info in before hook.

[racke]

Commandline options (#471).

[xsawyerx]

• No middleware support. (use Plack::Builder instead)
• Use Test::Plack, not Test::TCP, LWP::Protocol::PSGI, or Dancer2::Test.

[xsawyerx]

Speeding up your app in D2:

• URL::Encode::XS
• CGI::Deurl::XS
• HTTP::Parser::XS

[xsawyerx]

Additional change:

• Routes are required to have a leading /. (see: Routes must have leading slash #581)
• (soon) Prefixes will not be allowed to have a postfix /. (see: Prefixes should not allow trailing slashes #593)

[shumphrey]

hooks are now app specific not global

[xsawyerx]

• No need for ':syntax' anymore

[racke]

before hook is fired even on files in public - that might be a bug!?

[jacqueslareau]

[% if settings.environment == "development" %]

Was working in Dancer1, not anymore.

[xsawyerx]

Those might be bugs though. Let's open "question" issues for them.

[jacqueslareau]

• A note on how engines (session, logger) configuration changed.
• Dancer2::Session::DBI and Dancer2::Plugin::Auth::Extensible are not available yet.
• hooks are not global anymore.
• Cannot seem to find any information on "use Dancer2 appname => 'MyApp';" as a patch.
• :script ?
• behind_proxy: just wanted to point out that it's not clear if behind_proxy replaces ReverseProxy, or if both can be used together or not