Topic: 0.2.1 released

- Added plugins for brokerages and tools
- Added version update notification
- Added benchmark to performance tool
- Show brokerage notes in settings panel
- Use buy/sell price for stocks that do not have data
- Polished interface
- Fixed bugs when portfolio is empty
- Fixed bug where program would hang when importing transactions
- Fixed grid rendering on windows
- Improved performance of outputting grid data (transactions, news, etc)
- Improved performance of rebuilding benchmark portfolios
- Cleaned up tool resizing