Move status into the settings object

Only the very early boot code needs to look at the value
from the environment directly.

app/views/site/edit.html.erb

@@ -1,7 +1,7 @@
 <% content_for :content do %>
-  <% if STATUS == :database_offline or STATUS == :api_offline %>
+  <% if Settings.status == "database_offline" or Settings.status == "api_offline" %>
     <p><%= t 'layouts.osm_offline' %></p>
-  <% elsif STATUS == :database_readonly or STATUS == :api_readonly %>
+  <% elsif Settings.status == "database_readonly" or Settings.status == "api_readonly" %>
     <p><%= t 'layouts.osm_read_only' %></p>
   <% elsif !current_user.data_public? %>
     <p><%= t '.not_public' %></p>

app/views/site/offline.html.erb

@@ -1,4 +1,4 @@
-<% if STATUS == :database_offline %>
+<% if Settings.status == "database_offline" %>
 <p><%= t 'layouts.osm_offline' %>
 </p>
 <% else %>

app/views/traces/_trace.html.erb

@@ -1,7 +1,7 @@
 <tr>
   <% cl = cycle('table0', 'table1') %>
   <td class="<%= cl %>">
-    <% if STATUS != :gpx_offline %>
+    <% if Settings.status != "gpx_offline" %>
       <% if trace.inserted %>
         <a href="<%= url_for :controller => 'traces', :action => 'show', :id => trace.id, :display_name => trace.user.display_name %>"><img src="<%= url_for :controller => 'traces', :action => 'icon', :id => trace.id, :display_name => trace.user.display_name %>" border="0" alt="" /></a>
       <% else %>

app/views/traces/show.html.erb

@@ -2,7 +2,7 @@
   <h2><%= t '.heading', :name => h(@trace.name) %></h2>
 <% end %>
 
-<% if STATUS != :gpx_offline %>
+<% if Settings.status != "gpx_offline" %>
   <% if @trace.inserted %>
     <img src="<%= url_for :controller => 'traces', :action => 'picture', :id => @trace.id, :display_name => @trace.user.display_name %>">
   <% else %>