Remove USB/serial support: network-only protocol, drop tinyusb and PICOBOOT

lib/client/types.go

@@ -2,9 +2,6 @@ package client
 
 import "github.com/theater/picomap/lib/msgpack"
 
-type RequestPICOBOOT struct{}
-type ResponsePICOBOOT struct{}
-
 type RequestInfo struct{}
 type BootReason uint8
 
@@ -108,8 +105,6 @@ type Envelope struct {
 func init() {
 	msgpack.RegisterExt(0, (*Envelope)(nil))
 	msgpack.RegisterExt(1, (*DeviceError)(nil))
-	msgpack.RegisterExt(2, (*RequestPICOBOOT)(nil))
-	msgpack.RegisterExt(3, (*ResponsePICOBOOT)(nil))
 	msgpack.RegisterExt(4, (*RequestInfo)(nil))
 	msgpack.RegisterExt(5, (*ResponseInfo)(nil))
 	msgpack.RegisterExt(6, (*RequestLog)(nil))