ObjectManger implementation

- functionality for backend object mangling and unmangling
szh added into data repositories

- szh added
ObjectLink mangler and unmangler

- ObjectLink mangler
- ObjectLink unmangler
ObjectMangler unit test

- simple ObjectMangler generic unit test
Required server-side validation

- implantation of required keyword validation
Server-side validation of type keyword

- type keyword validation
Manglers unit tests

- ObjectLink mangler and unmangler unit tests
- Type validator unit tests
- Require validator  unit tests
Dirty fix of menu in print

- quick fix to remove menu from print
Added support for limiting count of search results

- added limit into search
FIX ObjectLink search on input into search field

- fixed searching when user types value in search field
Default limit and sort for ObjectLink lookup

- added default limit
- added default sort
Added ObjectMangler into search functionality

- objects are mangled in search
User security page added support for paging.