Ergonomic builder and wrapper improvements

[Hiddentale]

Description

Three ergonomic improvements to the generated and hand-written API:

• map_memory returns *mut c_void directly instead of taking a *mut *mut c_void output parameter. Hand-written wrapper added to the exclusion set.
• Builder setters accept &T for *const VkFoo fields (e.g. p_application_info, p_enabled_features, pipeline state pointers). Eliminates the &*builder deref pattern throughout all examples.
• DeviceCreateInfo::enabled_layer_names slice setter now generated. vk.xml marks this field as deprecated with no len attribute, so the codegen infers the count field by naming convention (ppEnabledFooNames → enabledFooCount).

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

Checklist

• I ran cargo fmt --all (code is formatted)
• I ran cargo clippy --workspace --all-targets -- -D warnings (no warnings)
• I ran cargo test --workspace (all tests pass)
• I added tests for new functionality
• I updated relevant documentation

Documentation Checklist

• All new public items have doc comments (see CONTRIBUTING.md)
• # Safety section on all unsafe functions
• # Errors section on all Result-returning functions
• Examples compile: cargo test --doc
• No broken doc links: RUSTDOCFLAGS="-D warnings" cargo doc --no-deps