Feature: add custom project option.

[halyssonJr]

Description

The PR aims to add a new option simulate an external LVGL projects from LVGL Editor, for example. It's important to include this part in CMakeLists.txt in the LVGL Editor Project.

    add_library(custom_ui_lib ALIAS lib-ui)

    target_include_directories(lib-ui PUBLIC 
        ${CMAKE_CURRENT_SOURCE_DIR}
    )

    target_link_libraries(lib-ui PUBLIC lvgl)

    target_compile_definitions(lib-ui PUBLIC USE_CUSTOM_PROJECT)

---

Summary by cubic

Added a CMake option to load and link an external custom LVGL project. This lets you simulate a UI project (e.g., from LVGL Editor) without changing this repo.

• New Features

  • Added USE_CUSTOM_PROJECT (OFF by default).
  • Configure CUSTOM_PROJECT_PATH to a project with a CMakeLists.txt; included via add_subdirectory.
  • Links custom_ui_lib to main and prints status/warnings for invalid paths.

• Migration

  • Enable with: -DUSE_CUSTOM_PROJECT=ON
  • Set path with: -DCUSTOM_PROJECT_PATH=/path/to/project

[halyssonJr]

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[halyssonJr]

@kisvegabor, Could you please review this PR? The main goal here is to test and validate the project created in the LVGL Editor before installing it on your device, saving time and ensuring the screen flow is correct. If, for any reason, this contribution follows a different path than planned for the roadmap, we must close it.