Support for Python editions (83PCEEP and 84+CEPE)

[adriweb]

The "TI-83 Premium CE Edition Python" just came out, and here is what we know from the units we've seen so far (datecode L-0419M):

Software:

• OS 5.3.6.0018 (download here) - Update: OS 5.4 has since been released with the Python app (June 27th)
• Boot 5.3.6.0017

Hardware:

• PCB label: SG95/F/T-10-2(2L)
• ASIC: JB-007-01 S7TM2-010
• Flash: Winbond W25Q32JVS1Q - Serial NOR ; datasheet
• ARM Coproc (for Python): Atmel SAMD21 E18A-U (Cortex-M0+, 48 MHz, 256 KB flash) ; datasheet

PCB photo available here and interactive comparison with slider thingy over the rev L 83PCE.

[adriweb]

@jacobly0 started documenting some things :) http://wikiti.brandonw.net/index.php?title=Special:RecentChanges

[adriweb]

To split:

• HW rev. M stuff (new flash) -> can be merged at any time, will probably just be a "minor" feature part of the 2.0 release.
• Python stuff (ARM coproc) -> specific branch to be merged for a dedicated release :)

[adriweb]

Title updated to reflect the current/upcoming models

[adriweb]

for clarity due to other issues being created:

• non-python stuff related to hw-rev M+ have already been merged and are available in the latest release / nightly.
• python-specific things (co-proc emulation and communication etc.) are still a work in progress, with dev from @jacobly0 and @calc84maniac

Once that's done, there will be a proper release for it, with a guide on how to get it running.