Removing 'plot_eval_func_call' declaration, artifact from 7e0431f5606eefbde56a9fd6763d1cdd6a3fbb80
refactoring function call logic into `plot_eval_apply`

refactoring:
 - control functions to use this instead
 - refactoring `plot_func_control_apply` to also use this

still have to refactor `plot_eval_form` to also use `plot_eval_apply`.