* Add possibility to call a shell script to make changes to sdk just before building the app
* Changes to Makefile
* Changed pre_build.sh to only contain some comments how to use it
* Moved "Makefiles" (or large parts) from SDKs to APP git.
This way we can make changes to e.g. include additional source files
without making changes to the SDKs
Added a folder "platforms", with content for LN882H, XR809 and W800
for as far as I know, adding source files will be included by default
with the other platforms
* fix mixed up Makefiles for W800
* Changes for W600