BAP-3961: Left side navigation bar

  - added configuration options for changing menu position
  - developed templates structure, allowing to change menu position according configuration
Merge branch 'master' into ticket/BAP-3961
BAP-3961: Left side navigation bar

  - refactored structure of header and main-menu styles
  - redeveloped concept of left and right panels
  - decorated sided main-menu
  - added icons for first level menu items
BAP-3961: Left side navigation bar

  - fixed line feed at files ends
Merge branch 'master' into ticket/BAP-3961
BAP-3961: Left side navigation bar

 - fixed content width calculation
BAP-3961: Left side navigation bar

 - reverted changes of renaming #oroplatform-header selector in styles
BAP-3961: Left side navigation bar

 - decorated user menu
 - decorated pintabs
BAP-3961: Left side navigation bar

 - minor fixes
Merge branch 'ticket/BAP-3961' of /home/hryhorii/Sites/crm/src/Oro with conflicts.
BAP-3961: Left side navigation bar

 - fixed footer size on configuration page
 - cursor pointer on left menu
 - styled message for empty pinbar
 - fixed triangle style for active menu
BAP-3961: Left side navigation bar

 - added translations for configuration page
BAP-3961: Left side navigation bar

 - develop maximize/minimize action for side-menu
Merge branch 'master' into ticket/BAP-3961
BAP-4017: Develop and decorate application menu (maximized)
BAP-4016: Decorate combined search and shortcut menu
BAP-4180: Restructure entities menu

 - entities menu restructured
 - configuration settings saves with page reload
 - flash message positioning improved
BAP-3961: Left side navigation bar

 - fixed selenium tests
Merge remote-tracking branch 'origin/master' into ticket/BAP-3961
BAP-3961: Left side navigation bar

 - fixed selenium tests