fmsg: implement suspend in writer

This removes the requirement to call fmsg.Exit on every exit path, and enables direct use of the "log" package. However, fmsg.BeforeExit is still encouraged when possible to catch exit on suspended output.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/fmsg/verbose.go

@@ -1,25 +1,23 @@
 package fmsg
 
-import "sync/atomic"
+import (
+	"log"
+	"sync/atomic"
+)
 
 var verbose = new(atomic.Bool)
 
-func Verbose() bool {
-	return verbose.Load()
-}
+func Load() bool   { return verbose.Load() }
+func Store(v bool) { verbose.Store(v) }
 
-func SetVerbose(v bool) {
-	verbose.Store(v)
-}
-
-func VPrintf(format string, v ...any) {
+func Verbosef(format string, v ...any) {
 	if verbose.Load() {
-		Printf(format, v...)
+		log.Printf(format, v...)
 	}
 }
 
-func VPrintln(v ...any) {
+func Verbose(v ...any) {
 	if verbose.Load() {
-		Println(v...)
+		log.Println(v...)
 	}
 }