Fix bevy_ghx_proc_gen and bevy example compilation

[academician]

I ran into some trouble running the bevy examples due to some upstream changes in both bevy and bevy_editor_cam.

• bevy::platform_support was renamed to bevy::platform: Rename bevy_platform_support to bevy_platform bevyengine/bevy#18813
• bevy::log wasn't resolving without enabling Bevy's bevy_log feature, I believe because of the revert in Revert "Allow partial support for bevy_log in no_std (#18782)" bevyengine/bevy#18816.
  • I put the usage of bevy_log behind a cargo feature called "log" in case it's desired to be optional.
• The compiler could not find an impl of the bevy::ecs::bundle::Bundle trait for bevy_editor_cam::EditorCam. Bumping the version of bevy_editor_cam to 0.6.0 fixed this.

After these changes, the examples all compile and run. I also considered bumping bevy to 0.16.1, which also worked fine, but left that out of this PR.

[Henauxg]

Thanks ! 👍