Attempt to simplify as much as possible Inset parameter dialog creation. We now just...

Attempt to simplify as much as possible Inset parameter dialog creation. We now just need an ui file and a class that inherits InsetParamsWidget and implement 4 methods. Then InsetParamsDialog will take care of the rest. InsetParamsDialog has 2 running mode: "immediate apply" and "Restore/OK/Close" which is the default; I hope this is enough to satisfy all users. The checkbox status might be saved later in session settings.

This new attempt replace the previous attempt with InsetDialog which was still too tight with the older framework.
Status:
float, ert, box, info: migrated
vspace: migrated but buggy. To be fixed later.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@33480 a592a061-630c-0410-9148-cb99ea01b6c8