BaseFileWizardFactory: rename createWizardDialog method to create

Unify name of parameters object that gets passed into the method while
at it anyway.

Change-Id: I9cfdfe3b7dcdbd5e083b3b91922053be3a63b081
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Introduce BaseFileWizard

Introduce BaseFileWizard and derive all File Wizards from that.

Change BaseFileWizardFactory::create(...) to return a BaseFileWizard.

Change-Id: Ic0cb9e9d0390045dab57cd1a75a0f839c1f90216
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
BaseFileWizardFactory: Remove ExtensionList type and extensions() method

Change-Id: Ia68924fac19739e26ddb1c660eb23d2df3e5b0c1
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Replace internal struct with class

Coding style fix

Change-Id: If7b0d1154094084a9be0276f1d8fd9e32a44eb92
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Inline CustomWizard::initWizardDialog()

It is used only once, so get rid of that indirection.

Change-Id: I017abe58cdcdcc7f8b6c6c1c81296a7ef4cd81cd
Reviewed-by: Orgad Shaneh <orgads@gmail.com>