- Update to version 1.29.0
  The key highlights of this release are the change of pl_gpu API
  semantics to use explicit erroring instead of implicit undefined
  behavior, and several important bug fixes related to swapchain
  resizing (in particular, handling of suboptimal swapchains);
  as well as other minor utility changes, bug fixes and performance
  improvements.
  The new pl_gpu API allows clients to duplicate less code related
  to checking parameters and capabilities, as long as they're fine
  with the resulting error messages they might receive. In
  particular, libplacebo no longer aborts on invalid parameters -
  which helped during initial development, but is now suffocating
  clients more than it's helping.
Additions:
  * add a new field pl_fmt.internal_size, which can differ from
    texel_size for emulated formats
  * add 16f / 64f texture formats with host-emulated 32f
    representation
  * expose a pl_vulkan_choose_device helper function
  * add a mechanism for allowing the user to explicitly resize
    suboptimal swapchains rather than having libplacebo take care
    of it
Changes:
  * make pl_gpu log and error gracefully on illegal parameters
    rather than doing undefined behavior (i.e. aborting)
  * creating a host_mapped buffer now requires
    PL_GPU_CAP_MAPPED_BUFFERS
  * drop priv fields from public structs
Fixes and performance improvements:
  * make libplacebo slightly less log spammy in general

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