A small correction in the CMake files

Proposed changes in the commit:

• new HINTS for libmpsse location in cmake/Findlibmpsse.cmake

  The installation from the source placed the headers and the lib under /usr/local/ -- let's add this location to the hints.

• renamed FindLibFTDI1.cmake to get rid of warnings from the findPackage

  cmake/FindLibFTDI1.cmake -> cmake/Findlibftdi1.cmake

  CMake would rise warnings that the target name LibFTDI1 is not equal to the library file name. All other CMake modules under cmake/ have small letter names, like cmake/Findlibmpsse.cmake. Let's align ftdi with everything else.

  Renamed Pico the same way.

• updated the logic in general CMakeLists: it is FTDI1, not just FTDI

  src/CMakeLists.txt