WIP: Issue 5 changes

[aviciano]

WIP of changes suggested in #5

• replace sdb logic to just be an array of structs in C
• fix few syntax things to match r2 coding style
• write an rbin plugin that tells the user to use uf2:// instead.. or maybe we can make rbin redirect to a different io plugin on demand. fs plugins already do a similar thing and i think it can be doable, also for other plugins like the dyldcache

[trufae]

<3 ill work on the bin->io redirector poc and let you know how the thing must work

[aviciano]

Awesome, I definitely need help with this part.

Blocks with not main flash flag can be used to store debug info or source code (1, 2). What's the right way to handle this?

The UF2 format can be used as a file container, so I was thinking of adding a fs plugin as well. I didn't find any sample, but I did find a tool to create them: files2uf2