all: remove deprecated packages

Closes #24.

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

helper/proc/deprecated.go

@@ -1,63 +0,0 @@
-// Deprecated: This package will be removed in 0.4.
-package proc
-
-import (
-	"context"
-	"io"
-	"os"
-	"os/exec"
-	"time"
-	_ "unsafe" // for go:linkname
-
-	"hakurei.app/internal/helper/proc"
-)
-
-//go:linkname FulfillmentTimeout hakurei.app/internal/helper/proc.FulfillmentTimeout
-var FulfillmentTimeout time.Duration
-
-// A File is an extra file with deferred initialisation.
-type File = proc.File
-
-// ExtraFilesPre is a linked list storing addresses of [os.File].
-type ExtraFilesPre = proc.ExtraFilesPre
-
-// Fulfill calls the [File.Fulfill] method on all files, starts cmd and blocks until all fulfillment completes.
-//
-//go:linkname Fulfill hakurei.app/internal/helper/proc.Fulfill
-func Fulfill(ctx context.Context,
-	v *[]*os.File, start func() error,
-	files []File, extraFiles *ExtraFilesPre,
-) (err error)
-
-// InitFile initialises f as part of the slice extraFiles points to,
-// and returns its final fd value.
-//
-//go:linkname InitFile hakurei.app/internal/helper/proc.InitFile
-func InitFile(f File, extraFiles *ExtraFilesPre) (fd uintptr)
-
-// BaseFile implements the Init method of the File interface and provides indirect access to extra file state.
-type BaseFile = proc.BaseFile
-
-//go:linkname ExtraFile hakurei.app/internal/helper/proc.ExtraFile
-func ExtraFile(cmd *exec.Cmd, f *os.File) (fd uintptr)
-
-//go:linkname ExtraFileSlice hakurei.app/internal/helper/proc.ExtraFileSlice
-func ExtraFileSlice(extraFiles *[]*os.File, f *os.File) (fd uintptr)
-
-// NewWriterTo returns a [File] that receives content from wt on fulfillment.
-//
-//go:linkname NewWriterTo hakurei.app/internal/helper/proc.NewWriterTo
-func NewWriterTo(wt io.WriterTo) File
-
-// NewStat returns a [File] implementing the behaviour
-// of the receiving end of xdg-dbus-proxy stat fd.
-//
-//go:linkname NewStat hakurei.app/internal/helper/proc.NewStat
-func NewStat(s *io.Closer) File
-
-var (
-	//go:linkname ErrStatFault hakurei.app/internal/helper/proc.ErrStatFault
-	ErrStatFault error
-	//go:linkname ErrStatRead hakurei.app/internal/helper/proc.ErrStatRead
-	ErrStatRead error
-)