* General code cleanup
* The internal data struct type `BeaconData` is now public and can be used by the application.
* `NimBLEBeacon::setData` now takes `const NimBLEBeacon::BeaconData&` instead of `std::string`.
* Added overload for `NimBLEBeacon::setData` that takes a pointer to raw `uint8_t` data and length`.
* `NimBLEBeacon::getData` now returns `const NimBLEBeacon::BeaconData&` instead of `std::string`.
* msbFirst parameter has been removed from constructor as it was unnecessary,
caller should reverse the data first or call the new `reverseByteOrder` method after.
* `getNative` method replaced with `getBase` which returns a read-only pointer to the UUID size underlying.
* Added `reverseByteOrder` method, this will reverse the bytes of the UUID, which can be useful for advertising/logging.
* Added `getValue` method, which returns a read-only `uint8_t` pointer to the UUID value.
* Removed `m_valueSet` member variable, `bitSize()` can be used as a replacement.
* General code cleanup.
* Sets macros to allow compiling when Central role is enabled and Observer disabled, or Peripheral enabled and Broadcaster disabled.
* Adds a macro definition for CONFIG_NIMBLE_CPP_IDF to enable different include paths/functionality for IDF / Arduino.
This allows NimBLE options in menuconfig to reduce code size based on
the roles selected (scan/advertising/central/peripheral).
Significant code space can be saved by removing unnecessary roles for the application.
