* don't refer to non-existant "cutter-small.png"
* icon renaming as requested:
https://github.com/radareorg/cutter/pull/180#issuecomment-349686261
* Fixes#174
References semi-automatically updated to track
renaming, hopefully caught them all.
(appears to have worked upon quick inspection)
* Add SidebarWidget from disassembly sidebar
* Remove disassembly sidebar from MemoryWidget
* Add HexdumpWidget from MemoryWidget
* Remove Hexdump from MemoryWidget
* Make PreviewWidget from MemoryWidget
* Some cleanup
* Rename DisassemblyView to DisasseblyWidget