StandardPanelViewModel is introduced

#### Purpose

Currently we are at point when `ClassInformation` class includes a lot of information which connected with UI not data. It was decided to add `ViewModel` for `StandardPanel`. At `Model` layer for `StandardPanel` will be used `ClassInformation`.

#### Modifications

Created `StandardPanelViewModel` as derived from `BrowserItem`. `StandardPanelViewModel` replaces `ClassInformation` in `LibarryWrapPanel`, `ClassObjectTemplateSelector`, `StandardPanel`.

#### Additional references

[MAGN-4641](http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-4641).

#### Reviewers

@Benglin, please take a look at initial part of work. For now I just replaced `ClassInformation` to `StandardPanelViewModel`. Without improving the logic as you proposed. I would like ensure that I am on right way. Thank you.