[FIX]m.Toolbar: Float should have no effect on a flex item.

- Empty width should return instead of auto when control width is not
found.
- Cleanup for hand-over.
- Toolbar header font size fix.

Change-Id: I6157a2fcc10025d8b554a1778f70a7db38fbcc21
(cherry picked from commit 403a42f7dad7aaf1b73706b8bca27c2f831c38c4)
CR-Id: 012003146900009388182014
[FIX] sap.m.UploadCollection: Replacement of 'internet_explorer' with
'msie' in explored

CR-Id: 012003146900009404492014
Change-Id: I9e0d2c12b2ef34e72835842cfa1e5a95cc784267
Merge "[FIX]m.Toolbar: Float should have no effect on a flex item." into rel-1.26