Name autocomplete makes it hard to enter names that start with common words

[iandees]

There's a place nearby called "We Are Nuts". When I try to type "We" + space into the name field, it autocompletes to a store called "WE - somethingsomething", capitalizes the e for me, and it's hard to go back and fix that incorrect capitalization:

[bhousel]

Scope creeping on this issue (#5568 is related)...

• fix keyboard handling of up/down arrow and escape when a combobox is open (these keys should not do other iD things like trying to pan the screen or return to browse mode)
• escape should get rid of whatever autocompletion selected text is there
• up/down key navigation seems to not class the top item as selected if the list is too long / or scroll the item into view / or something
• this means that tabbing out of the list with the wrong item selected can accept an item that is not the one selected/displayed in the input field

I've added an option to disable autocomplete behavior.. I might keep it or get rid of it depending on how the combobox "feels" after I make it do all the things that I expect a combobox to do. We could also start out autocompleting and then maybe put the combo into "no autocomplete" mode after the user starts backspacing or something.