Achieved by adding a new element property called CarriesTypeIn, whose bits signal to save loading code which properties of particles of the element class in question carry element IDs. The bits in this property are numbered the same way as sim.FIELD_* constants for consistency. One would signal from Lua that a custom element carries element IDs in its tmp like this:
elem.property(id, "CarriesTypeIn", 2 ^ sim.FIELD_TMP)
"Carrying an element ID in a property" is to be interpreted as follows: the property is treated as a combination of a PMAPBITS-bit (so, currently 9-bit) unsigned integer lower part holding an element ID and a 32-PMAPBITS-bit (so, currently 23-bit) signed integer upper part holding whatever makes sense for the element. CONV, for example, uses this signed integer in its ctype as the extra "v" parameter for particle creation.
Some checks on particles, most importantly whether their element IDs refers to an enabled element, were done _before_ in-save element IDs are mapped to in-simulation element IDs. This resulted in some particles being removed if their IDs were unlucky enough.
A bug existed before where certain events would not update Engine's lastTick. If the sim was lagging hard, then this could cause "script is not responding" errors to appear in unintentional situations.
The starting execution time is tracked in LuaScriptInterface instead now, and set in tpt_lua_pcall
Also replace a few rename calls with RenameFile calls. Old code doesn't expect rename to overwrite existing files without question, when it in fact can.
These are the only bit of shared state between the Request user thread and RequestManager that aren't covered by RequestHandle::stateMx. The problem was that they were not covered by anything, which meant that they were not guaranteed to be coherent between threads.
Also fix WriteFile being unable to overwrite existing files. The rename would fail because the file was still open, and the sanity remove in response to that would also fail for the same reason.
We can't rely on atexit, handlers registered with it are in a hard to establish ordering relationship with destructors of static and thread-local objects.
Namely: no, yes, and yes and ask at startup.
The install_check option is thus replaced by the can_install option. -Dinstall_check=true maps to -Dcan_install=yes_check, while -Dinstall_check=false maps to -Dcan_install=yes. -Dcan_install=no is new and is recommended for downstream packaging, where -Dinstall_check=false was historically used.
Also improve error messages about bad configuration here and there and scatter configuration code in subdirectories, where they can be closer to their areas of effect.
... while retaining all the functionality of stamps.def.
Also fix stamp names encoding only 32 bits of the timestamp, migrate from stamps.def to stamps.json if the latter doesn't exist, delete both on migration to the shared data directory, rescan stamps at startup, and make rescanning a painless process in general by removing invalid entries and adding missing entires at the beginning of the list.
