[FEATURE] sap.ui.commons.Splitter: Adapt F6 handling

Change-Id: Ieb3c599a585bf6c895114808b39379714f89bf39
[FEATURE] sap.ui.ux3.ExactBrowser: Adapt F6 Handling

Change-Id: I79b8d738067bb7e9f74ddaebf3e617fb1ce1e67d
[FEATURE] sap.ui.unified.ShellHeader: Introduce F6 handling

Change-Id: I4a487ffac1ef24a33e46768e7ac37a501c9a88e2
Merge "[FEATURE] sap.ui.commons.Splitter: Adapt F6 handling"
Merge "[FEATURE] sap.ui.unified.ShellHeader: Introduce F6 handling"
Merge "[FEATURE] sap.ui.ux3.ExactBrowser: Adapt F6 Handling"