commitmonitor Code

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.

* add an empty line after the license header
* remove unneeded empty lines at the end of files
* use the right case for the includes
* always use <> for system headers
* update ext/Versions.txt

patch from XhmikosR:
bump the copyright year, remove unwanted spaces and convert some tabs to spaces.

convert tabs to spaces.

Fix broken build.

code cleanup:
* rename CRegStdWORD to CRegStdDWORD
* replace the stdstring defing with a typedef for tstring
* get rid of the wide_string typedef, use std::wstring instead

Remember the size and position of the diff viewer window.
This implements issue #41.

Indicate the GPL license.

Make ESC quit the diff viewer, if the find window isn't visible.
If the find window is visible, ESC will first close that find window.