Massive rework of platform layer user/organization

The goal of this rework is to make it so I can pass around platform.User
instead of a pair of models.Organization and models.User. This is useful
for reason I kind of forget now, but it started with working on
notifications and ballooned massively from there into refactoring a
number of things that were bugging me.

This also includes a tiny amount of work on server-side events (SSE).

 * background stuff lives inside the platform now, which I need for
   having it push updates through SSE
 * userfile now lives in the platform, under file, so other platform
   functions can safely use it
 * oauth is broken into pieces and inside platform because other stuff
   was calling it already, but badly.
 * notifications go into the platform as well

platform/background/text.go

@@ -0,0 +1,43 @@
+package background
+
+import (
+	"context"
+
+	"github.com/Gleipnir-Technology/nidus-sync/config"
+	"github.com/Gleipnir-Technology/nidus-sync/platform/text"
+	"github.com/rs/zerolog/log"
+)
+
+var channelJobText chan text.Job
+
+func ReportSubscriptionConfirmationText(destination text.E164, report_id string) {
+	enqueueJobText(text.NewJobReportSubscriptionConfirmation(
+		destination,
+		report_id,
+		config.PhoneNumberReport,
+	))
+}
+
+func enqueueJobText(job text.Job) {
+	select {
+	case channelJobText <- job:
+		log.Info().Msg("Enqueued text job")
+	default:
+		log.Warn().Msg("sms job channel is full, dropping job")
+	}
+}
+
+func startWorkerText(ctx context.Context, channel chan text.Job) {
+	go func() {
+		log.Debug().Msg("Text worker started")
+		for {
+			select {
+			case <-ctx.Done():
+				log.Info().Msg("Text worker shutting down.")
+				return
+			case job := <-channel:
+				text.Handle(ctx, job)
+			}
+		}
+	}()
+}