Changes:
Updated Libuv to 1.41.0
Fix/add support for Lua 5.4
CMake: Only require finding Lua libs via find_package on Windows
fs_{read,write}: make offset argument optional and default it to -1
Add udp_set_source_membership binding + improve udp_set_membership
Add pipe_chmod binding
Add process_get_pid binding
Add handle_get_type and req_get_type
Add method form of uv.cancel: req:cancel()
Add loop_configure binding
Fix garbage collection-related memory bug with threads
fix install path for make install with Luajit 2.1
Fix args potentially being garbage collected before use in luv_spawn
fix bug in luv_check_fs
Add uv.loop_mode function
Add BUILD_STATIC_LIBS to Makefile
fix a memry bug in thread pool work callback
Fix possible memory leak in lhandle.c
fix memleaks in luv_cpu_info
fs: Print destination paths in error messages for the relevant functions
Make symlink/copyfile bindings more user-friendly
Fix shared library build failure on macOS
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