script properties & UUID types

scripts can now declare properties that show up in the inspector and get saved per entity. also ripped std::string UUIDs out of most of the engine in favor of an actual Core::UUID type, plus some scripting additions and a few tests.

changes

script properties

• Prop("SpeedOrSomething", 2.5), PropEntity("TargetEntity") and PropUI("MyRect") for regular values, entities and UI elements
• properties show up under each script slot in the inspector, with appropriate controls and per-slot values
• values are only readable during top-level script execution, so store them in variables for use in hooks. Prop in a hook just returns the fallback
• saved as scriptProperties in scene JSON, omitted when empty
• property edits support undo, including live number/string editing. unused saved properties can be pruned with undo too..
• ScriptSlot is move-only now

Core::UUID

• replaced string UUIDs across the registry, UI, editor commands, project config, save directories and scripting with a 16-byte Core::UUID
• registry UUID lookups now use an index instead of looping through entities
• malformed UUIDs in files fall back to generated or nil UUIDs
• UI UUIDs are saved and restored, including nested elements. duplicate UI UUIDs are handled without crashing the loader
• savegame directories etc take a UUID directly

scripting & UI

• script objects now have identity values and wrappers are readonly, along with various scripting result objects. came with an ObSL bump
• UI wrappers get SetParent(parent) and a uuid field. null reparents an element to the root
• UISystem::Reparent preserves ownership and prevents parenting an element under its own descendant
• new created scripts use fn on_update(dt) (I wrote on_update() last time …oops…)

smaller stuff

• UndoManager::Execute returns whether the command applied
• script list shows filenames with Remove beside them

tests and docs

more tests and docs updated ofc…

so u can reference entities in scripts without using Find() now!!!