Fix bFLT loader

-Operator precedence and wrong pointer assignment
Add nspire-tools path command

-Returns absolute path to the ndless sdk
Fix Makefile.tpl

-$(DESTDIR) used together with vpath
Newer version of nspireio
Add support for --gc-sections
Fix SCREEN_BASE_ADDRESS for C++
Fix errorneous nspireio header

-And use UTF-8 in touchpad.c