[WIP] Fix ban by software version, some other under-hood changes

- Use updated version of upstream go-xmpp + fixes on client-side
- Introduce golangci-lint v2 + fixes
- Move especially noisy debugging stuff to separate config handles to be able to switch them off
- Add a bit debug to ban by software path

vendor/github.com/xmppo/go-xmpp/xmpp_http_upload.go

@@ -0,0 +1,38 @@
+package xmpp
+
+import (
+	"encoding/xml"
+)
+
+type Slot struct {
+	// TODO: Maybe this doesn't belong here
+	ID      string
+	XMLName xml.Name `xml:"slot"`
+	Put     Put
+	Get     Get
+}
+
+type Put struct {
+	XMLName xml.Name `xml:"put"`
+	Url     string   `xml:"url,attr"`
+	Headers []Header `xml:"header"`
+}
+
+type Get struct {
+	XMLName xml.Name `xml:"get"`
+	Url     string   `xml:"url,attr"`
+}
+
+type Header struct {
+	XMLName xml.Name `xml:"header"`
+	Name    string   `xml:"name,attr"`
+	Value   string   `xml:",innerxml"`
+}
+
+// Oob is an out-of-band url/description, used in file uploads.
+// See https://xmpp.org/extensions/xep-0066.html
+type Oob struct {
+	XMLName xml.Name `xml:"x,xmlns:jabber:x:oob"`
+	Url     string   `xml:"url"`
+	Desc    string   `xml:"desc"`
+}