Tracker: Style fix, capitalize share icons hex

... just to make them consistent with the rest.
Tracker: Tiny style fix to Bitmaps.cpp
Tracker: tiny style fix, explicit NULL check
Tracker: Style fixes to ContainerWindow
Tracker: miscellaneous style fixes
Tracker: style fixes to Model
Tracker: style fixes to PoseView

Variable renaming for consistency and clarity
Tracker: Pose style fixes kind => which
Tracker: Style fix, move headers down in Navigator.cpp
Tracker: Style fixes to Navigator.h
Tracker: include ContainerWindow.h in Navigator.h
Tracker: Style fixes in Tracker (app)
Tracker: Update Tracker nav bitmaps and layout
Tracker: Style fixes to IconCache and Utilities
Tracker: yet more style fixes
Tracker: return B_BAD_VALUE if you pass in a NULL dir
Tracker: Write Desktop icon attrs only once
Tracker: Write Trash icon attrs only once

Also create Trash if does not exist but check the if the icon
attrs are set separately.

Only set the vector trash icon #ifdef __HAIKU__ does this
even matter anymore?
Tracker: style fixes to ContainerWindow
Tracker: style fixe, update comment, spelling

...and fits on 1 line