browser-plugin: add clipboard copy support

Only supporting copy, evince doesn't support editing (at least the API
is lacking cut and paste)

Using property access workaround.

Example:
    if (plugin.canCopy) {
        plugin.canCopy = 42;	(workaround) copy selection to clipboard
    }

1 files changed, 1 insertions, 0 deletions

diff --git a/browser-plugin/scriptable.h b/browser-plugin/scriptable.h
index cc6ac1c..763ead2 100644
--- a/browser-plugin/scriptable.h
+++ b/browser-plugin/scriptable.h
@@ -94,6 +94,7 @@ class ScriptablePluginObject : public ScriptablePluginObjectBase
 	private:
 		NPIdentifier mTitleID;
 		NPIdentifier mZoomID;
+		NPIdentifier mCanCopyID;
 		NPIdentifier mMagicWrapperID;
 
 		NPIdentifier mZoomInID;