[Squirrel-sql-develop] Latest changes

[Colin B. <col...@bi...>]

Plugin API mods
---------------
PluginManager.getPluginAppSettingsFolder(IPlugin) and
PluginManager.getPluginUserSettingsFolder(IPlugin) replaced by
IPlugin.getPluginAppSettingsFolder() and
IPlugin.getPluginUserSettingsFolder()

ISession.addSQLExecutionListener() and ISession.removeSQLExecutionListener()
added.

Plugin functionality mods
-------------------------
Integrated Johans code for create table/insert scripts into the sql script
plugin.

Look and Feel plugin now changes the look and feel on the fly.