minor for class Image
new feature: alternative notation for keys and key modifiers including inner waits and repeats e.g. "#M+a#M-#BACK.#W300.abc#N3.#T4.abc" means CMD+a, BackSpace, wait 300 msec, abc, enter 3 times, tab 3 times, abc,
added a lightweight remote feature (get a screenshot, propagate keyboard/mouse actions)
mods to support alternate screen/robot implementations, added in Region write with alternate key/keymodifier specification