Added package summaries to more packages

backends/doc.go

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+// Package backends contains sub-packages that register backends with tomo when
+// linked into a program.
+package backends

backends/x/doc.go

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+// Package x implements an X11 backend.
+package x

dirs/dirs.go

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+// Package dirs provides access to standard system and user directories.
 package dirs
 
 import "os"

flow/flow.go

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+// Package flow allows an asynchronous process to be written sequentially.
 package flow
 
 // Flow represents any multi-stage process that relies on callbacks to advance

input/input.go

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+// Package input defines keyboard and mouse code constants.
 package input
 
 import "unicode"

layouts/layout.go

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+// Package layouts defines a layout interface which a container element can
+// accept to have its child elements automatically arranged by any layout that
+// satisfies it.
+//
+// Sub-packages of layouts contain several pre-made ones.
 package layouts
 
 import "image"

popups/doc.go

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+// Package popups provides a set of pre-made pop-up windows such as dialog
+// boxes.
+package popups

shatter/shatter.go

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+// Package shatter provides boolean operations for image.Rectangle.
 package shatter
 
 import "image"

theme/doc.go

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+// Package theme implements a theming system for tomo.
+package theme