Change layout to more go-style-ish, replace some modules

* Deejay files, split them to achieve go-style project layout
* Replace logrus with log/slog module to reduce dependencies
* Replace gopkg.in/ini.v1 with github.com/wlevene/ini to make sure all modules BSD licensed
* Update linter config && fix tons of linter warnings
* Update .gitignore
* Update README.md

vendor/golang.org/x/sys/unix/fdset.go

@@ -23,7 +23,5 @@ func (fds *FdSet) IsSet(fd int) bool {
 
 // Zero clears the set fds.
 func (fds *FdSet) Zero() {
-	for i := range fds.Bits {
-		fds.Bits[i] = 0
-	}
+	clear(fds.Bits[:])
 }