Also removed orphaned private attributes.

Note that child size is adjusted in method onSizeChanged.

Now adjustment is done in method onSizeChanged() instead in onMeasure().

Fixes issue #10: incorrect number of rows in multi-window environment

(keep angle but swap start and end colors)

avoid resize of "close" button in window list layout and split offsets(margin/padding) between items and activity

Now inflater is from application activities instead system one.

Starting with API 26, findViewById uses inference for its return type, so we no longer have to cast.
Old definition:
  View findViewById(int id)
New definition:
  <T extends View> T findViewById(int id)

Synchronization of project files with gradle 5.0 fail with message "Failed to notify build listener".

Handled by new application main activity - TermActivity.
As an enhancement was added email to navigation header.

Closes #11.