pic WIP: add drawing code modified from particles example
bugfix: string type formatting for _handler functions
add precomp helper function
don't auto-write header file for xtmlibs (assume it's done already)
add correct (for precomp) preamble to audio_dsp
bugfix for precomp log writer
individual precomp works for core math, audio and instruments
precomp fft.xtm works
sndfile precompiles
all the stdlib libs now precompile
update lib paths on a couple of examples
moved precomp stuff into runtime/scheme and runtime/extempore
update gitignore
add precompile-stdlib.sh
update sys:oad calls in raymarcher example
mass-commenting-out of sys:load "libs/xtm.xtm"
rename precomp global