Allow moving cursor by prev/next words

[Swoorup]

Fixes: #10593

New Shortcuts:
Alt+B or Ctrl + Left : Go left (back) one word.
Alt+F or Ctrl + Right: Go right (forward) one word. (If we are at the end of sentence, upon pressing this key, we advance the cursor at end of the line, even though there are no words)

[KevinRansom]

@Swoorup , hi this is a great feature. Testing it out on my PC, I see a couple of issues.

1. Ctrl+Left and Ctrl+Right don't work. eyeballing the code, I can't see why ... perhaps check out if it works for you.
2. Alt + B works fine moving to the start of the previous word. However Alt + F puts the caret before the last character of the current word.

Before:

After Alt+F

[Swoorup]

@KevinRansom Fixed the issue. I noticed some shells like python use multiple stop characters (stopping on ',") when moving words compared to when deleting word which just looks for spaces, but we could always improve this later on.

[Swoorup]

@KevinRansom regarding the ctrl, I can't test it since i don't have a windows box :(

But I think the issue was because the first match block wasn't filtering out Ctrl modifiers keys. Let me know if you find issues.

[cartermp]

Thanks! This works great on Windows as well.

[cartermp]

Just to note: tested it all and it works as per @KevinRansom's feedback