NSIS 2.46

# Minor Changes

* Fixed !searchparse (bug #2803622)
* Fixed Vista error message when canceling uninstaller (bug #2803097)
* Resolve warning for LogicLib's endless Do..Loop (bug #2849872)
* StartMenu: fixed random number prefixes when clicking on an empty spot (bug #2810188)
* Updates to NSIS.pas for plug-in development (patch #2802794)

# Translations

* PortugueseBR typo (patch #2826598)
* Removed double spaces in Italian (bug #2873598)

# Build System

* Fixed mingw builds of Math plug-in (patch #2835731)