This commit changes the defalt compile option in relation to FPU from "hard" to "softfp" in
Makefile template, because it would be better to maintain the consistency with "build.py" and "make.py"
that have the default option, "softfp".
If the "hard" option is needed, execute "make HARDFP=1" on command line.
* '-g' has been added for all the build to produce debugging information. '-g' allows to get the symbols when debugging with GDB.
* introduce the macro 'DEBUG' to enable/disable build optimization.
Limitations:
* Support in non-Makefile projects has been added.