- Added a new Email defintion (which will soon see it's components changed)

- Added a new post-install script for composer which adds a project skeleton "ready to use".
- Error 500 are now handled properly in production; waiting to see if adjustements will be required before adding other code pages.

view/lean/error/500.phtml

@@ -0,0 +1,24 @@
+{% extends "lean/layout/error" %}
+
+{% language.set "lean.error.500" %}
+
+{% title _('page-title') %}
+
+{% section "content-right" %}
+    <div>
+        <div class="title">{% _ "title" %}</div>
+        <div class="subtitle">{{= isset($subtitle) ? nl2br($subtitle) :  _("subtitle") }}</div>
+        <div class="content">{{= isset($message) ? nl2br($message) :  _("message") }}</div>
+        <u><a href="#" onclick="history.back()">{% _ "back" %}</a></u>
+    </div>
+{% endsection %}
+
+{% section "content-left" %}
+    <img class="picto-login" src="{% asset 'static/img/bugs.svg' %}">
+{% endsection %}
+
+{% section "head.css" %}
+    .title {font-size:2rem}
+    .subtitle {font-size:1.25rem; padding-top: 1rem;}
+    .content {padding-top:1rem}
+{% endsection %}