add admin plugins API and start testing

lib/WebGUI/Admin/Plugin.pm

@@ -0,0 +1,44 @@
+package WebGUI::Admin::Plugin;
+
+use Moose;
+use Scalar::Util qw(blessed);
+
+has 'id' => (
+    is          => 'ro',
+    isa         => 'Str',
+    required    => 1,
+);
+
+has 'title' => (
+    is      => 'rw',
+    isa     => 'Str',
+);
+
+has 'icon' => (
+    is      => 'rw',
+    isa     => 'Str',
+    default => '',      # Find a good default
+);
+
+has 'iconSmall' => (
+    is      => 'rw',
+    isa     => 'Str',
+    default => '',      # Find a good default
+);
+
+sub BUILDARGS {
+    my ( $class, $session, %args ) = @_;
+    return { session => $session, %args };
+}
+
+sub canUse {
+    return 1;
+}
+
+sub getUrl {
+    my ( $self, $method, $params ) = @_;
+    $method ||= "view";
+    return '?op=admin;plugin=' . $self->id . ';method=' . $method . ';' . $params;
+}
+
+1;