.function_indexes does not detect all functions

[vStone]

.function_indexes only supports a very limited set of functions in specific cases.
It should contain all possible functions in a manifest.

Version: 4.2.4

Example code:

class foobar {
  $x = function_assign_to_var('foobar')
  $y = 'foobar'.function_assign_inline_no_parenthesis
  $z = 'foobar'.function_assign_inline_with_args('arg2')
  function_call_with_args('xxx') # detected
  function_call_parent(function_call_nested('x')) # both functions are detected.
  chain.multiple().calls('to').functions
}

.function_indexes only contains 3 functions (see comments)

It should contain

• function_assign_to_var
• function_assign_inline_no_parenthesis
• function_assign_inline_with_args
• function_call_with_args
• function_call_parent
• function_call_nested
• chain
• multiple
• calls
• functions

It also seems that there are no tests for function_indexes.