changed dropFileExtension() implementation

BaseLib filename string manipulation rewrite.

Place it in StringTools.

Use extractBaseName() now.

And also add ExtractBaseNameWithoutExtension tests.

Replace getFileNameFromPath(f, true/false) with corresponding extractBaseName() and extractBaseNameWithoutExtension().

Calling getFileNameFromPath() for now.

Both windows and unix versions.

This fixes #29.

This fixes #27.

This fixes #25.

Conflicts:
	BaseLib/FileTools.h

moved functions getFileNameFromPath(), getSuffixFromPath(), copyPathToFileName() and extractPath() from files StringTools.{cpp,h} to files FileTools.{cpp,h}

Doxygen improve.

moved functions trim(), replaceString(), splitString() and template functions number2str() and str2number() into namespace BaseLib