Using conan 2 to retrieve Jansson and libuv.

[Renaud-Marteleur]

Using Conan 2 to retrieve Jansson and libuv:

• A Python conan file was added to retrieve libuv (1.10.2 or more, but less than 2) and Jansson (2.10 or more but less than 3).
• CMakeLists were updated to find libuv and Jansson based on names used in Conan recipes (i.e. uv and jansson).
• CMake files to find libuv and Jansson were removed.

Build successfully with: conan build . --build=missing -s build_type=Release