This patch fixes some (mostly small) plugin issues with the "big"
YH-keymap patch (a507b). Only one fix affects the main keymaps
(virtual keyboard "DONE" now exits after long key /release/ instead
of long button /press/).

Change-Id: Id34f925ebfa97ae4974cd9405fbe1fee4f597833

Change-Id: I1f39cb93081738e757101cdf6aeb5e3a1ca0e42c

 - Comment keymaps.h
 - Tie XWORLD_DEBUG into ROCKBOX_HAS_LOGF to ease debugging
 - Fix up the manual a little bit

Change-Id: I12cfb58001199036cd67dbaa27f164e6790a199d
Reviewed-on: http://gerrit.rockbox.org/1084
Reviewed-by: Michael Giacomelli <giac2000@hotmail.com>

Co-conspirators: Franklin Wei, Benjamin Brown

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This work is based on:
- Fabien Sanglard's "Fabother World" based on
- Piotr Padkowski's newRaw interpreter which was based on
- Gregory Montoir's reverse engineering of
- Eric Chahi's assembly code

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Progress:

* The plugin runs pretty nicely (with sound!) on most color targets
* Keymaps for color LCD targets are complete
* The manual entry is finished
* Grayscale/monochrome support is NOT PLANNED
  - the game looks horrible in grayscale! :p

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Notes:

* The original game strings were built-in to the executable, and
  were copyrighted and could not be used.
* This port ships with an alternate set of strings by default, but
  can load the "official" strings from a file at runtime.

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To be done (in descending order of importance):

* vertical stride compatibility                          <30% done>
* optimization                                           <10% done>

Change-Id: I3155b0d97c2ac470cb8a2040f40d4139ddcebfa5
Reviewed-on: http://gerrit.rockbox.org/1077
Reviewed-by: Michael Giacomelli <giac2000@hotmail.com>