v0.1.10: enhancement to web archiving

• build parameter is now optional to NM.target
• nomake help now does not show Options: if there are no options.
• adding Path.extensions() method to return all extensions of a file path.
• adding the following path string converters for their extreme frequent use in any project.
  • NM.fixExePath(string, OS): NM.fixExePath('a', 'windows') -> a.exe
  • NM.fixDllPath(string, OS):
    NM.fixDllPath('libaa.so.8', 'linux') -> libaa.so.8,
    NM.fixDllPath('libaa.8', 'linux') -> libaa.8.so.
  • NM.fixHostDllPath(string): NM.fixHostDllPath(a) == NM.fixDllPath(a, NM.Platform.currentOS)
  • NM.fixHostExePath(string)
• adding NM.urlToValidFileName() for converting a URL to a short & valid file name.
• NM.webArchive now uses urlToValidFileName to generate unique names for downloadeded files.