paths are pretty janky, but it works. Also, [files]/lang_files now must
be the path to a directory CONTAINING a "lang/" directory. I'll work
around this at a later date.
The local app translations are loaded, and then if [files]/lang_files
is provided (a directory containing custom translations), any found
inside it are loaded over top. This makes customizing much easier.
ioutil's contents are now in io and os.
Eventually jfa-go's files will be embedded in the binary with go1.16's
new embed feature. Using io/fs will provide abstraction for accessing
these files, and allow for both embedded and non-embedded versions.
Also, internal paths to things like email templates, etc. will be
prefixed with "jfa-go:" to indicate to use the app's own Filesystem
instead of reading the file normally. This also allows for custom files
to continue to be used as they are currently.
