Minor change : Link to MSVC14 Standalone

Add the new link to "Microsoft Visual C++ Build Tools" if MSVC14 is not installed.

Fix misspellings

msvc fixes

Fixes : 
- Bad argument name
- Better Python 2 compatibility

Improved support for MSVC discovery

Reindent to avoid raw strings and hanging indents. Let os.path.join provide the backslash characters.

Don't use deprecated 'U' flag to read manifest