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PPageFileInfoClip: Various cosmetics.

 - Reduce the visibility of member functions and variables.
 - Simplify the initial focus handling.
 - Various clean-ups.
PPageFileInfoDetails: Various cosmetics.

 - Reduce the visibility of member functions and variables.
 - Simplify the initial focus handling.
 - Various clean-ups.
Properties dialog: Make some strings of the "Details" tab translatable.
Properties dialog: Convert the creation time to the local timezone.
PPageFileMediaInfo: Various cosmetics.

Reduce the visibility of the member functions and variables and simplify the code.
PPageFileInfoRes: Various cosmetics.

Reduce the visibility of the member functions and variables and simplify the code.
Property dialog: Decide whether to show the "Resources" tab without checking the graph twice.
Property dialog: Ensure the focus stays consistent when switching to the "Resources" tab.

Previously the file name could get highlighted.
Property dialog: Make the UI more consistent between the tabs.

The header was slightly different on the "Resources" tab.
EVR-CP and Sync renderers: Remove useless use of interlocked functions.

The critical sections are lock protected so there is no need for interlocked functions which is a good thing being that those functions were badly used and did not protect anything anyway.

Fixes CID 1249711 and CID 1249712.
MediaInfo tab: Enable the "Save As" button only if some info is available.

Being that the tab can be displayed before the info is available or even if none could be found, it makes sense to disable the button in those cases.
DSUtil: Remove duplicated function "FileExists".
Cosmetics: Remove unused include.
DSUtil: Remove duplicated function GetProgramPath.
Cosmetics: Use PathUtils::GetProgramPath when possible.
VSFilter: Remove an unused function.
Cosmetics: External toolbar image: Replace nested if by loops.
AStyle: Increase max-instatement-indent from 40 to 50.
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