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st3m: gfx: Implement locking using FreeRTOS semaphores

dos requested to merge dos/flow3r-firmware:semaphores into main

OSD timeout is increased to 500ms, as micropython's GC pauses can easily push it into 100-200ms territory. Aside of that, no functional changes are expected except of making the synchronization actually reliable across cores.

This still doesn't fully fix OSD blinking/corruption issues, but it should be a step in the right direction.

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