Supports unix-style binary_has_prefix paths in windows binaries
fixes a typo
Don't use the build_prefix until it is known

See #177
Don't bother with the build string if it uses a , or a |
Don't set the prefix in the environ module until it's used
Make sure all environment variables reflect the correct build prefix
Make sure all variables use the correct prefix in environ.py

Remove the global variables from the module level and only use the functions.
add function conda_convert()
make --platform option only required for conda packages
simplified how output_dir is handled
add ability to convert Gohlke's .exe packages
separate new code into module
add new function info_from_fn
add globals constants
add filename pattern
update changelog
add write_info() to make code more readable
simplified regex
simplified much of the code by repacking in memory
allow -v option