Option to use a minimal, small UI

[delphidabbler]

When using Unit2NS with Delphi it would be useful to be able to have a much smaller interface that can be tucked out of the way in one corner of the screen.

Given that I use Delphi maximised, a stay on top function for unit2ns would be useful too.

The minimal interface could dump the mapping selection and customisation, and the section used to display units in a scope and just have the unit lookup controls (or a reduced version of them).

The idea is that we start unit2ns in its full size state to configure it but then switch to the small window to use it with Delphi with the option to return to the full window at any time.

[delphidabbler]

To clarify, the part of the UI that would be displayed in minimal mode would be the part circled in yellow below.

The controls would need to be rearranged. If possible the lookup should be automatic as the unit name is typed (per issue #18) and selecting a scope name should copy the path to the keyboard. That would obviate the need for both buttons.

And the references to namespaces in the UI would need fixing (per issue #19)

[delphidabbler]

Could use the following icons

To open minimal window, place

in the top right corner of the circled box above.

To return to main window place the following icon on minimal window:

From Google material icons.

[delphidabbler]

And the references to namespaces in the UI would need fixing (per issue #19)

The UI has now been amended in develop, as of commit 9f0eea8.