Includes all the latest NimBLE stack changes from idf-v4.0 with few idf-v3.3
specific modifications.
- Addition of nimble component as submodule (`nimble-1.1.0-idf-v3.3`), contains
IDF v3.3 specific minor changes.
- Example applications are identical to idf-v4.0
- Modification in `bt/Kconfig` to accommodate NimBLE as a BT host.
1. add the L1 include path with a prefix, such like osi/list.h, stack/a2d_api.h and etc.
2. modify component, only bluedroid/api/include/api is export to another component and application,
other include path just for bluedroid used
3. put bluedroid/include into common/include/common, so the root directory of bluedroid have no include path.
4. modify doxygen to use esp_bt.h and redirect to
component/bt/bluedroid/api/include/api/
fix compile
