* Add codename to version string and to bootloader title.
* Use EDGETX_VERSION_SUFFIX instead of CODENAME
* use "dev" instead of "merge" and "custom" instead of "SB".
Changed to lower case for "nightly" and "release".
* Show TEST BUILD warning screen for all non release builds.
* Improved logic
* Removed TEST_BUILD_WARNING, reverted to "merge" and changed to "selfbuild".