ESB - Epic Serial Bus

This (huge) commit introduces an epic_usb_ API along with the underlying private usb/ module in epicardium

The functionality is split between core/device/config:

epc_usb, the core, is independent of the actual device being (de)initialized. It services MAXUSB's API for enumeration as well as USB event handling

cdcacm, mass_storage in usb/ provide device-specific callbacks for use by ebc_usb

modules/usb binds fatfs, flash and cdcacm to these callbacks and defines the actual USB descriptors to be used.

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• c6a963b9 - fix pycardium meson.build

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• f2f5b990 - no annoyatron, I don't want to break these lines. also my local clang-format does not change this

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added 3-Epicardium label

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• 28b59944 - usb: don't reset configure/deconfigure handlers

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• 3eed30c5 - code style

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Looks good to me! Thanks for keeping our codebase clean.

However, I'm only a bot - so a human will still have to approve this request.

@swym, what's the current state of the implementation? Is it ready for merge?

Can you please rebase onto latest master? I think, you also need to choose new API IDs because we merged button support ...

mentioned in issue #73 (closed)

mentioned in issue #19

added 85 commits

• 3eed30c5...283e227c - 77 commits from branch card10:master
• 84a96a4d - mx25lba: be less spammy
• 0286ca9f - feat(epicardium): add usb module
• e8f675b4 - fix pycardium meson.build
• 7be1bc24 - no annoyatron, I don't want to break these lines. also my local clang-format does not change this
• 6d018032 - usb: don't reset configure/deconfigure handlers
• 51da45df - code style
• 8f6b78f2 - tabs to spaces
• 95355e5b - esb_config: use typedef esb_cfg_handler for callbacks

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added 7 commits

• 989c783b - feat(epicardium): add usb module
• f4ea670c - fix pycardium meson.build
• ca6a6a88 - no annoyatron, I don't want to break these lines. also my local clang-format does not change this
• d213f763 - usb: don't reset configure/deconfigure handlers
• db51ef60 - code style
• d28e8de6 - tabs to spaces
• 9bbeca5b - esb_config: use typedef esb_cfg_handler for callbacks

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added 1 commit

• 4c5767dd - cdcacm.c: --SysTick_Handler

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