Major pull request

It took a bit longer than expected, but it comes with a whole lot of changes.
Don't look at the diff, you will probably not recognize much, to clean up I moved everything around.
I removed the scite and nspire_emu folders, IMO they should get their own repo. https://github.com/antoniovazquezblanco/nspire_emu is a fixed version which compiles with newer MinGW as well. I haven't made a Scite repo as I don't use it myself so testing is basically senseless.

![zehn_info](https://cloud.githubusercontent.com/assets/1622084/3762440/0d70af1a-1897-11e4-860b-cf07b6521634.png) ![zehn_exception](https://cloud.githubusercontent.com/assets/1622084/3762491/a464f76e-1897-11e4-89ac-88f0b5867192.png) ![zehn_flags](https://cloud.githubusercontent.com/assets/1622084/3762493/a7ed3a22-1897-11e4-8d94-77f82ecfa239.png)

Major changes:
-Zehn (Exceptions, iostream, faster loading and faster execution, additional information etc.)
-libsyscalls, so that syscall stubs have their own symbols (makes porting MUCH easier)
-Tighter newlib integration
-Reorganised header files, removed everything that was deprecated
-Revised build system (ndless-sdk/bin/* stuff)
-Split up ndless installer and resources (and got rid of NDLS_LIGHT)

This breaks:
-All Makefiles: "genzehn" has to be executed manually on the final .elf file.
-Old libraries from the nl_relocdata era if the "resources-loader" is being utilized. Ndless then thinks it's a normal "PRG" program and relocates already relocated data. Will crash or cause arbitrary writes/reads without warnings!
-Some programs using deprecated stuff
-Maybe even more I'm not aware of