Build Fix and Improvements

[bitigchi]

No description provided.

[ryandesign]

There's a lot going on in this PR, but at least the commit entitled "Fix build" is needed to fix build failure with Xcode 15:

hardware_reader/smc_reader.m:6:22: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
kern_return_t SMCOpen()
                     ^
                      void
hardware_reader/smc_reader.m:38:23: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
kern_return_t SMCClose()
                      ^
                       void
hardware_reader/applesilicon_hardware_reader.m:57:28: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
static void initEventSystem(){
                           ^
                            void