C-API headers missing standard includes #448

Several of the C-API interfaces in this library declare use of std types (bool, uint, etc.) without including the std headers where they are defined. This leads to order-dependent include requirements within the consuming application if those types are not inherently defined. Examples I've found so far:

• MicroOcpp_c.h: Declares bool without stdbool.h
• Configuration_c.h: Declares bool without stdbool.h

I can put up a PR to cover these, but if there's others I've missed feel free to list them out!