Add more actions and action_flags

[aquamarine5]

• stbks.action.*
• • .ignoreerror
• stbks.action.copy
• • .overwrite
• stbks.action.execute
• • .waitforexit
• stbks.action.delete
• • .isdirectory
• stbks.action.runpkgaction
• stbks.action.open
• • .createnowindow
• • .waitforexit
• stbks.action.cleancache
• • .ignorefile
• • .ignoredepressed
• stbks.action.replaceall (3.0.0.725)
• • .keepzipfile (3.0.0.725) (no longer available, seealso stbks.action.cleancache)
• stbks.action.applyselfupdate (3.0.726.0)