Log Message:
graphics/gpick: Update to 0.3

* Fix build with Boost 1.86.0.
* Fix usage of Lua include file to fix link.
* Convert to CMake build.

Changelog:
0.3:
Bug Fixes

    Fix layout switching (issue #189).
    Prevent wrong data directory selection (issue #189).
    Fix crash due to zero-length string access (issue #193).

Features

    Add alpha channel support.
    Add additional converters.