qmonnet / rbpf / 20956896577
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Cargo.toml,README.md: Bump version to 0.4.0

Main features since v0.3.0 include:

- Support for eBPF-to-eBPF function calls with automatic stack frame
  management, including:
  - stack frame context preservation during function calls
  - maximum nesting level of 8 function calls
  - customizable StackUsageCalculator for stack size optimization
  - support in both interpreter and JIT modes
  - assembler and disassembler support for eBPF call instructions

- JIT support in no_std mode - users can now manually provide executable
  memory areas to use JIT without requiring the standard library.

- Replacing single-byte address representation with Range type for
  memory access ranges, to reduce memory overhead for maps storing large
  amounts of data; and using the hashbrown crate for better HashMap
  performance in no_std mode.

- Reduced dependency on libc, obtained by replacing several calls with
  standard library alternatives:
  - Replaced rand() with a simple Wyrand implementation
  - Replaced libc::memcpy with ptr::copy_nonoverlapping
  - Replaced libc memory allocation with std::alloc
  Only mprotect() remains as a libc dependency.

- Bumping cargo edition to 2024

- Dependency updates, including:
  - replacing the deprecated time v0.2 crate with std::time::Instant,
    providing cross-platform monotonic time functionality using only the
    standard library
  - cranelift
  - elf (we were stuck with a very old version because newer versions
    had breaking changes; these changes have now been addressed)

- Various fixes and clean-ups

(These notes were mostly generated from the Git history by Claude Code.)

Signed-off-by: Quentin Monnet <qmo@qmon.net>

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