BPicture: Attach as many picture tokens as promised.
BView: Fix ClipTo[Inverse]Picture() syncing.

When BPictures are created on the stack and go out of scope, they send a
AS_DELETE_PICTURE command to the ServerApp thread, and that command may be
processed sooner than the AS_VIEW_CLIP_TO_PICTURE command in the ServerWindow
thread, causing that command to no longer find a ServerPicture for the given
token. Apparently, the Be API leaves you the choice not to sync, in case for
example when you cache your BPictures and they remain valid. The default
value for "sync" is true. The BeBook could explain the situation better when
sync is needed and when not.
ServerWindow: Fix converting the clip picture origin

The current view state is already used for the picture playback, the
remaining conversion needs to take into account screen location and scrolling
offset of the view. This may need further investigation: a) When is this
updated? It needs to be whenever a View changes screen location, size or scroll
offset, which may not be the times when this method is called. b) I am not
sure if the scrolling offset is indeed part of this conversion...
Tracker: Style fixes to BPoseView
Tracker: Only open items if doubleclick w/ primary MB

Also rename fLastClickPt to fLastClickPoint
Tracker: swap using std::swap()
Tracker: some style fixes to BContainerWindow()
Tracker: add class name to pragma
Tracker: Add SecondaryMouseButtonDown method

Create this utility method in Utilities.cpp and use it elsewhere tell if the
secondary mouse button is pressed or if it is emulated with a control-click.
Tracker: Make context menu work with control-click

in additional to secondary mouse button click, uses same utility function.
Tracker: Don't change selection if right-click

... inside a selection. If you click outside a selection extend the
selection to include the new items as Tracker normally would and
then pop up the dialogs.

Works with control-click as well, same utility function used.

Fixes #10449
NTFS: Codestyle cleanup