The previous way to clear a skybox was to set it to "default", and if the mission had no skybox then it would be cleared. The skybox code can correctly handle the lack of a skybox, but if you pass an empty string to the skybox preloader it fails with a file not found error. This fixes the preloader, and also adds "none" as an explicit no-skybox parameter.
* add node subtype for container names
* clean up and port changes to qtFRED
* fix parsing when container is the last argument
* fix serializing container name nodes
* fix parsing again
* disallow spaces in container names
* check for spaces and & chars while parsing container names
* early WIP for trying to get list containers of strings working as argument options
* indicate which SEXPs will be supported for now
* clean up
* add FRED/qtFRED support
* remove [in]validate-argument from supported SEXPs
* support map containers with string keys
* update FRED and qtFRED
* clean up
* update FRED help text
* revert some unneeded changes
* fix style
* remove added assertion
* backport useful changes from PR #4263 and then some
* clean up backport
* move condition_node evaluation outside of argument loop
* fix does_blank_of_op_support_container_args()
* fix assertion
* add OPF_DATA_OR_STR_CONTAINER and use restore old behavior of OPF_ANYTHING
* revert some unnecessary changes
* fix CI
* detect attempts to modify container while it is being used as special argument (WIP)
* evaluate conditional for each loop
* update placeholder text for new SEXP arg type
* finish/clean up
* add subsystem indexer and ensure that ship_get_indexed_subsys and ship_get_first_subsys are independent
* also add reverse lookup from subsys to index
* update indexer to accommodate subsystem pointers being changed
* use clearer function names, and fix the type of subsys_list_indexer
* add assertions
* address latest feedbcak
* Add callback for user specified availability status
* Add target restrict hook
* Fix Restrict hook and add not self restrict type
* Fix documentation
* Fix typo
* scope the ai achievability enum
* fix scoped achievabiliy
1) In `for-counter`, when `just_count` is true there is a memory leak, since the code never enters `test_argument_vector_for_condition`, but for the same reason, duplicating the string is not necessary in that case, so just add a blank string
2) Remove unnecessary `vm_strdup` calls from the other for-* operators
3) `const`ify argument management
Alt-names with hashes that were added by the `change-alt-name` sexp used to have their hashes truncated properly. This most likely broke when hash truncation was moved from the HUD code to the "display name" code. This PR truncates hashes in the same way as truncation elsewhere.
Goober5000