Improve cmake

[MhmRhm]

Here is a clean, modern, FetchContent-friendly CMake rewrite of the project. It is structured so that:

• works as standalone project
• works via FetchContent
• supports install() + find_package()
• keeps examples/tests optional
• avoids global flag pollution
• uses proper target-based CMake

How users consume it (FetchContent)

include(FetchContent)

FetchContent_Declare(
    minmea
    GIT_REPOSITORY https://github.com/your/minmea.git
    GIT_TAG master
)

FetchContent_MakeAvailable(minmea)

target_link_libraries(my_app PRIVATE minmea::minmea)

Or with find_package (after install)

find_package(minmea REQUIRED)

target_link_libraries(my_app PRIVATE minmea::minmea)

What is improved vs original

✔ Fully target-based

No global CMAKE_C_FLAGS

✔ Safe for embedding

Works inside other projects without side effects

✔ FetchContent compatible

No assumptions about install step

✔ Proper namespace

minmea::minmea

✔ Clean install/export system

Supports find_package

✔ Optional components

• examples
• tests
• install toggle

✔ Modern CMake practices

• generator expressions
• interface include dirs
• alias target