Fixes the compile error on llvm:
mixture of designated and non-designated initializers in the same initializer list is a C99 extension [-Wc99-designator]
- store parameter type and if volatile separately (saves kilobytes of flash)
- use Bitset for tracking active and changed parameters
- use atomic for autosave_enabled flag
- compile at ${MAX_CUSTOM_OPT_LEVEL} (-O2 on non flash constrained boards)
Beat Küng