Remove cache until ready to work on

cache/cache.go

@@ -1,13 +0,0 @@
-package cache
-
-// Cacher specifies high-performance caching for Bonzai commands with
-// guaranteed system-wide concurrency safety (across process
-// boundaries). Safe and strong caching support is a key Bonzai design
-// principle since much of what might have been put into getopt dashed
-// options and keys before is now done with contextual session cache to
-// preserve state between Bonzai command calls. It is not uncommon for
-// a given task to span multiple command calls. This also provides
-// support for operating-system independent command invocation history.
-type Cacher interface {
-	// TODO
-}