Required libraries can be installed silently #492

Description

Sequence of first time use:

1. Shortcut
2. OK in main dialog
3. Yes for "selected test framework is not installed..." dialog
4. OK for "Download Library from Maven Repository..." dialog
5. Yes for "mock framework is not installed..." dialog
6. OK for another "Download Library from Maven Repository" dialog
7. Yes for Mockito static methods
   Actually we can skip steps 3-7 with providing own JavaProjectModelModifier and getting rid of own extra dialogs

Expected behavior

After red warnings "will be installed" we install chosen libraries with no additional dialogs

Context

Plugin UX, first time use