fix issues related to incorrect app termination

• lingering audio on music app exit (#50 (closed))
• graphics issues when reentering the gay_drums app (#55 (closed))

added 19 commits

• 25e860f6...fee7e552 - 18 commits from branch flow3r:main
• bd894bc4 - fix issues related to incorrect app termination

Compare with previous version

This does not reset leds yet, so they are still active after closing an app. It could make sense for the "OS" to do this instead of the App, but I can implement it either way.

changed the description

mentioned in issue #55 (closed)

added 6 commits

• bd894bc4...dd6ad21c - 5 commits from branch flow3r:main
• 34fe6bcc - fix issues related to incorrect app termination

Compare with previous version

Uhhhh not sure I understand the issue this is trying to fix but keeping sound running after the application is backgrounded is intended behavior.

Other than that, this MR is doing several things at the same time and I don't think I can review it.

There exist other problems with 2 apps trying to update the screen simultaniously or 2 sound apps running through each other. It's a mess.

@dx : Could you specify the intended behaviour that looks acceptable?

sorry, fixed them ourselves in !218 (merged), !221 (merged), didn't see this.

it does appear that you continue using the channel in the next on_enter after freeing it. this is not advised because another application might be using it. we should clarify the docs there.

closed