freebsd: add initial support for running on FreeBSD, excluding Bluez,

ppd, and some things. Add a simple wpa_supplicant backend

core/internal/matugen/matugen.go

@@ -980,26 +980,6 @@ func signalTerminals(opts *Options) {
 	}
 }
 
-func signalByName(name string, sig syscall.Signal) {
-	entries, err := os.ReadDir("/proc")
-	if err != nil {
-		return
-	}
-	for _, entry := range entries {
-		pid, err := strconv.Atoi(entry.Name())
-		if err != nil {
-			continue
-		}
-		comm, err := os.ReadFile(filepath.Join("/proc", entry.Name(), "comm"))
-		if err != nil {
-			continue
-		}
-		if strings.TrimSpace(string(comm)) == name {
-			syscall.Kill(pid, sig)
-		}
-	}
-}
-
 func syncColorScheme(mode ColorMode) {
 	scheme := "prefer-dark"
 	if mode == ColorModeLight {