Enhance pveproxy by adding an optional ext5 parameter to load the extjs 5 framework

Calling the pveproxy with https://localhost:8006/?ext5=1 will
load the web ui with the extjs 5 js libs.
Please note that at the momment the workspace does not load with
extjs 5.
Signed-off-by: Emmanuel Kasper <e.kasper@proxmox.com>

PVE/Makefile

@@ -7,6 +7,7 @@ PERLSOURCE = 			\
 	API2Tools.pm		\
 	API2Client.pm		\
 	ExtJSIndex.pm		\
+	ExtJSIndex5.pm		\
 	TouchIndex.pm		\
 	NoVncIndex.pm		\
 	HTTPServer.pm		\

bin/pveproxy

@@ -22,6 +22,7 @@ use PVE::API2::Formatter::HTML;
 use PVE::HTTPServer;
 
 use PVE::ExtJSIndex;
+use PVE::ExtJSIndex5;
 use PVE::NoVncIndex;
 use PVE::TouchIndex;
 
@@ -204,18 +205,22 @@ sub get_index {
 	$mobile = $args->{mobile} ? 1 : 0;
     }
 
+	my $ext5;
+	if (defined($args->{ext5})) {
+	$ext5 = $args->{ext5} ? 1 : 0;
+    }
+
     my $page;
 
     if (defined($args->{console}) && $args->{novnc}) {
-	$page = PVE::NoVncIndex::get_index($lang, $username, $token, $args->{console});
-    } else {
-	if ($mobile) {
-	    $page = PVE::TouchIndex::get_index($lang, $username, $token, $args->{console});
+		$page = PVE::NoVncIndex::get_index($lang, $username, $token, $args->{console});
+    } elsif ($mobile) {
+		$page = PVE::TouchIndex::get_index($lang, $username, $token, $args->{console});
+	} elsif ($ext5) {
+		$page = PVE::ExtJSIndex5::get_index($lang, $username, $token, $args->{console});
 	} else {
-	    $page = PVE::ExtJSIndex::get_index($lang, $username, $token, $args->{console});
+		$page = PVE::ExtJSIndex::get_index($lang, $username, $token, $args->{console});
 	}
-    }
-
     my $headers = HTTP::Headers->new(Content_Type => "text/html; charset=utf-8");
     my $resp = HTTP::Response->new(200, "OK", $headers, $page);