v1.2.900

Prerelease from every stable master build

1. use existing installed everything
   • download .exe installer from https://www.voidtools.com/
   • use x64 version if your windows is 64bit
2. use existing installed python
   • download python3 from here https://www.python.org/downloads/
   • add python directory to %PATH% or set it use Settings UI)
   • some plugins may not compatiable with py3, ask the author to update their plugin
   • py3 will be used to develop plugins, so unicode problems should be fixed
3. fix can't save settings bug
4. new icons
5. add file associated icons (e.g. if you search .sln files, vs icon will be displayed)
6. much smaller! 18mb -> 1.8MB

installer will come in next prerelease, and python / everything installer will be bundled