commitmonitor Code

Remove variable reassignments.

Wrong print margin if measure unit is inch.
Based on TortoiseSVN r24390.

Print the diff when Ctrl+P is pressed.
(Closes issue #342) : "Print" facility for Unified Diff

Keep the resource string alive as long as it's needed.

Revert r748 since D2D in Scintilla causes too many problems, but keep the optimized font settings.

Fix a few /analyze and cppcheck warnings.
(Fixes issue #398) : Cppcheck and /analyze results

Enable Direct2D in the Scintilla control for the diff viewer.

use consistently an empty line between functions

Use smart pointers for allocating memory and fix a few memory leaks while doing so.
Also replace our custom auto_buffer with std::unique_ptr<>.

Fix compiler warnings for the x64 build.