Excerpt-include macro don't detect except macro when except macro is into an other macro

[Josue-T]

Step to reproduce:

1. Create a page with this content (at this reference: Sandbox.exerptsource.WebHome):

{{confluence_layout}}
{{confluence_layout-section ac:type="single"}}
{{confluence_layout-cell}}
{{excerpt name="name" inline="true"}}
my content from except
{{/excerpt}}
{{/confluence_layout-cell}}
{{/confluence_layout-section}}
{{/confluence_layout}}

2. Create an other page with this content

{{excerpt-include 0="Sandbox.exerptsource.WebHome" name="name" nopanel="true"/}}

Expected: we see the content

Currently: we have this error:

The reason of this issue is that we try to do a search in the XDOM before we do the rendering of the macro content and so we get only the top level macro and not the inner macro.

[ClemensRobbenhaar]

PR at #441