Only auto-join rooms when invited by allowed users

Previously, anyone (even across federation) could invite you to a
room and the bot would join. It may not have provided a useful purpose,
but it still joined all rooms it was invited to.

We now only join rooms when we're invited by a person who is actually
allowed to use the bot.

Fixes https://gitlab.com/etke.cc/postmoogle/-/issues/17

go.mod

@@ -11,8 +11,8 @@ require (
 	github.com/mattn/go-sqlite3 v1.14.14
 	gitlab.com/etke.cc/go/env v1.0.0
 	gitlab.com/etke.cc/go/logger v1.1.0
-	gitlab.com/etke.cc/linkpearl v0.0.0-20220826133247-10dcaedb8085
-	golang.org/x/net v0.0.0-20220822230855-b0a4917ee28c
+	gitlab.com/etke.cc/linkpearl v0.0.0-20220831124140-598117f26c77
+	golang.org/x/net v0.0.0-20220826154423-83b083e8dc8b
 	maunium.net/go/mautrix v0.12.0
 )
 
@@ -30,15 +30,15 @@ require (
 	github.com/olekukonko/tablewriter v0.0.5 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/rivo/uniseg v0.2.0 // indirect
-	github.com/rs/zerolog v1.27.0 // indirect
+	github.com/rs/zerolog v1.28.0 // indirect
 	github.com/ssor/bom v0.0.0-20170718123548-6386211fdfcf // indirect
 	github.com/tidwall/gjson v1.14.3 // indirect
 	github.com/tidwall/match v1.1.1 // indirect
 	github.com/tidwall/pretty v1.2.0 // indirect
 	github.com/tidwall/sjson v1.2.5 // indirect
 	github.com/yuin/goldmark v1.4.12 // indirect
-	golang.org/x/crypto v0.0.0-20220824171710-5757bc0c5503 // indirect
-	golang.org/x/sys v0.0.0-20220825204002-c680a09ffe64 // indirect
+	golang.org/x/crypto v0.0.0-20220829220503-c86fa9a7ed90 // indirect
+	golang.org/x/sys v0.0.0-20220829200755-d48e67d00261 // indirect
 	golang.org/x/text v0.3.7 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	maunium.net/go/maulogger/v2 v2.3.2 // indirect