new GUI framework

[mmagnuski]

1. avoid using GUIDE

2. write GUIs as objects - it eases up many things like graphical updates, syncing etc.

3. Externalize local functions that make sense to be used publicly

   for example - move winreject_refresh(h) out of winreject
   or - even better make refresh a pulic method of winreject object

4. Use linkfun_ prefix for functions that interface between GUIs (link functions).

   for example - a function that opens up multiedit_gui, sets relevant callbacks, validates output and updates main GUI would be a link function

5. have a clear structure in guidata (winreject has its guidata quite messy - this will be changed)

6. guidata should only store handles to figure objects, all other data should be setappdata and getappdata

[mmagnuski]

Some far-fetched, but related tasks:

• make winreject an object
• rewrite comp_explore as an object
• consider changing compsel to object
• move the comment above to 'how to contribute' section