rebase 12/02, use go1.16rc1 in make, remove ioutil, start switching to io/fs for file i/o

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.

pwreset.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"encoding/json"
-	"io/ioutil"
 	"os"
 	"strings"
 	"time"
@@ -53,7 +52,7 @@ func pwrMonitor(app *appContext, watcher *fsnotify.Watcher) {
 			}
 			if event.Op&fsnotify.Write == fsnotify.Write && strings.Contains(event.Name, "passwordreset") {
 				var pwr PasswordReset
-				data, err := ioutil.ReadFile(event.Name)
+				data, err := os.ReadFile(event.Name)
 				if err != nil {
 					return
 				}