Replace SelectStandard with input field + Dropdown

[OlliL]

Currently SelectStandard is a regular HTML select Element. Try replacing this with an input field

• opens a Bootstrap Dropdown once field is entered
• autoClose feature
• show selected Label in text field
• dynamically filter Elements based on what the user entered in the field
• what about many options.... make the dropdown scrollable itself

testbed: https://stackblitz.com/edit/suk19e-cu8qtu?file=index.html

[OlliL]

Bootstrap keydown eventhandler is currently preventing the following 2 points

• move back to input field when pressing ArrowUp while the very first Dropdown Menu item is focused
• [x] prevent immediate reopening of the Dropdown Menu when it was closed with ESC. This happens because our focus event handler gets executed when the input field gets refocused (and it has no clue about that ESC was triggering that focus)