Port the updates from 2.14.2 and the upcoming 2.14.3 to 3.0.0
Review Request #595 — Created April 6, 2021 and submitted
* Use the unicode version of the System and UserInfo plugins to fix non-english languages in the Windows installer. * Update the installer to use the inetc plugin so that https downloads will work. This became necessary because Sourceforge now redirects http to https. * Standardize everything in pidgin/win32/winpidgin.c to use `wprintf`.
Compiled and ran on windows 10.