commitmonitor Code

Make the serializer use only fixed types which are the same for 32-bit and 64-bit versions.
(Closes issue #387) : use the same data files for 32- and 64-bit versions

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

convert tabs to spaces.

(Fixes issue #200) : CommitMonitor fails to store repository information when a large amount of log information is retrieved
* drop the limit of 100kB for strings when serializing
* use a wchar_t static buffer for smaller wide char strings

Add methods to serialize a byte buffer.
This is required to solve issue #5.

Indicate the GPL license.

Improve the LoadString() function: reduce the amount of memory allocations.

Use a memory mapped file for loading the url infos.