add extern C declaration
add rest of access functions
fix up win32 build
fix build dependencies on win32
build fixes
update .gitignore
add license and readme
Add 'external/easysid/' from commit '37b2ab722059aee9888adc422d9ebd82387215cf'

git-subtree-dir: external/easysid
git-subtree-mainline: df0d7aff50f042fce2f2aa42d2d0ce8a685b07ea
git-subtree-split: 37b2ab722059aee9888adc422d9ebd82387215cf
add sid sample