[Squirrel-sql-develop] SQuirreL: Adoption of plugins to new multiple session window framework

Hi all,

Glenn Griffin and me, Gerd Wagner, are trying to fix the problems that 
SQuirreL had since the introduction of the multiple session window 
framework.

I just extended the Plugin API such that Session Plugins can support the 
new framework.

A Session Plugin might decide to not support the framework. Then it's 
functions are only available in the main session windows not in other 
session windows.

I was able to make most of the plugins that don't belong to me compile.
At the moment these plugins don't support the new framework. If you are 
interested in making those plugins support the new framework you may 
have a look at the editextras or the codecompletion plugin or ask me.

The following plugins had compile problems that are not connected to the 
new framework. I didn't fix these plugins:

laf, favs, sessionscript, mysql


Gerd