Add CRUD on functions and its requirements

[blcham]

As a user, I want to add functions and its required functions.

Acceptance criteria:

• CRUD for functions and their required functions is implemented
• To search function, the user should see with function name its component name

[blcham]

To view required functions there should be an icon (dependency) on the left of delete button. Upon clicking the list of required functions will be shown.

[blcham]

• change label of functions that are selected -- format should be "$function ($component)"
• add on-hover tooltip to see full name of function if the function name is too long