Add import path to compiler

Cookbook
1

If you want to import custom modules in another directory than the compiler modules:

options := Compiler.get_build_options();
import_path: [..] string;
Basic.array_add(*import_path, ..options.import_path);
Basic.array_add(*import_path, "/my/own/path/modules");
options.import_path = import_path;
Compiler.set_build_options(options, workspace);