build: Better Build System

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+.TH LSH 9.9
+.SH NAME
+lsh \- create layers and run shell commands
+.SH SYNOPSIS
+.B lsh
+[<file] [>file]
+.br
+.SH DESCRIPTION
+.I Lsh
+runs under
+.IR mpx (1)
+and reproduces a specified setup of layers.
+Each line of the standard input is of the form:
+.IP
+x0 y0 x1 y1 shell-command
+.PP
+For each line
+.I Lsh
+creates a layer whose diagonal spans the points
+.RI ( x0,y0 )
+and
+.RI ( x1, y1 ),
+where (0,0) is the upper left corner of the screen and (800,1024) is the
+lower right.
+If a shell-command is given, it is executed in that layer.
+.PP
+The standard output gives the coordinates of each layer that already exists and
+its downloaded object file, if any.
+This provides coordinates for an input script to duplicate
+a handmade setup.
+.SH BUGS
+Standard input cannot be the keyboard.