Merge pull request #163 from StanleyDing/cleanup

Finish chewing-utf8-util.h document.
When use MSVC, set WITH_INTERNAL_SQLITE3 true
Merge pull request #164 from blishs/master

When use MSVC, set WITH_INTERNAL_SQLITE3 true
Add more description to ueStrSeek().
Improve code readability.
Purge magic spaces in key2pho.c