2600box - An Atari2600 emulator for color targets

An Atari 2600 emulator for Rockbox originally uploaded to flyspray,
by Anton Romanov on 22 September 2006.  An effort to bring this
patch up to date with and compiling against HEAD/master.

Changes:
* Added rockbox style *.make
* a26/A26 file extention added to files.c
* Entry for viewers.config, can open *.a26 files from the file browser
* Keymaps for most color targets have been added to rbconfig.h
* Screen resizing/stretching has been fixed
* Various other "bringing up to date" changes

Todo:
* Simulators crash after a few seconds of button input
* There is no sound
* Some keymaps are not intuitive - I need feed back from testers
* Some keymaps are missing - I'm weeding these out as I test
* The code styling has not been formated to be rockbox conformant

Change-Id: I234c616e275a400eb135beee9ab8d104d8e263bf
FS#9583 - periodic table
- original rockbox port: Yifu Huang
- original work: Jonathan Bettencourt

- modifications made:
  - PLA-fy
  - Add element 117 (ununseptium)

Change-Id: Ibabfb0d28f794689ffcd8b9c360fb969d118de08
Left out sources and categories

Change-Id: Icd9da2792d37a6bcefb4a6dc5ce3a7d24ab55247
Fix warnings

Change-Id: Ib85c04cc35d32623d1bb02235bc400bf594a40e4
Fix error in sim builds

Change-Id: I6a6e9e195c7a8338cd7fb55883018f3c5d114652
Merge

Change-Id: I2077e01e3414bef741ce718da604971ded799d83
Amaze: save/load changes

Change-Id: I6a210b37e9a5164bd69acb0afbd806740d0dca24
Add Rockbox header, add yields in walkleft()

Change-Id: Iad22441cb278d16932296100ab0affc1f994f0ae
Merge commit 'refs/changes/62/662/2' of git://git.rockbox.org/rockbox into 2600box
Change copyright notice for amaze

Change-Id: I8573d0731c007e111a64440fec5218fca2fe9d3f
FS#8647: Amaze - 3D maze game plugin

- update to build against latest Git
- cleanup (whitespace, indentation)
- fixed old PLA handling
- update indentation/curly brace style
- improve load/save mechanism

Change-Id: Ic84d98650c1152ab0ad268b51bd060f714ace288
Merge

Change-Id: I62e6ce2f6bfb7a85e7475190280c7590838e578f