Unify look and feel for form components

[nikku]

Is your feature request related to a problem? Please describe.

Form components are used in separate parts of the application:

• properties panel
• dialog(s)

The components behave slightly different look and feel at the moment:

• green background / highlight in properties panels.
• OS background / highlight in deploy dialog

Describe the solution you'd like

Inputs have a consistent look and feel across the whole application. As this is a non-trivial matter, pulling the relevant parts of an UI framework (i.e. Bootstrap) could solve this for us.

#1558 (comment) sketches the effects (before / after).

Describe alternatives you've considered

None.

Additional context

Research work has been done in this department via #1558.

[nikku]

We can consider this topic as a future improvement.

[nikku]

Closing this issue (house keeping).