Allow scripts to be passed arguments via external means such as through tree & structure configs (soon to be object configs), and through the structure ts function.

This could be handled several different ways.
The passed arguments could simply be declared as variables at the start of the script, for example:

id: "SOME_OBJECT"
scripts: 
  - some_script: 1
script-arguments:
  - name: arg1
     type: STRING
     value: "a string"
  - name: arg2
     type: INTEGER
     value: 5

id "some_script";

// rest of script

Would be equivalent to:

id "some_script";

str arg1 = "a string";
int arg2 = 5;

// rest of script 

Alternatively scripts could treat arguments as placeholders, where the script would determine data type rather than the place the arguments are defined:

id: "SOME_OBJECT"
scripts: 
  - some_script: 1
script-arguments:
  - arg1: "a string"
  - arg2: 5

id "some_script";

str arg1 = $S{arg1};
int arg2 = $I{arg2};

// rest of script

With placeholders applied:

id "some_script";

str arg1 = "a string";
int arg2 = 5;

// rest of script