`0. in inputs.lora_multipliers` didn't work because the C array has
variable length.
Also fixed a few corner cases related to the default multipliers
(mainly to ensure robustness against future changes, since in most
cases the multiplier list is already sanitized by a previous
function).
* fix corner case in sd_oai_transform_params
Also fix typo in the function name.
* support for customizing loaded LoRA multipliers
The `sdloramult` flag now accepts a list of multipliers, one for each
LoRA. If all multipliers are non-zero, LoRAs load as before, with no extra
VRAM usage or performance impact.
If any LoRA has a multiplier of 0, we switch to `at_runtime` mode, and these
LoRAs will be available to multiplier changes via the `lora` sdapi field and
show up in the `sdapi/v1/loras` endpoint. All LoRAs are still preloaded on
startup, and cached to avoid file reloads.
If the list of multipliers is shorter than the list of LoRAs, the multiplier
list is extended with the first multiplier (1.0 by default), to keep it
compatible with the previous behavior.
* support for `<lora:name:multiplier>` prompt syntax and metadata
* add a few tests for sanitize_lora_multipliers
