Revision - Bug fixes and updates
- Graciously handle expired API keys by checking them before loading
- Positions table: added popup menu item to choose template, also added menu item to hide current column
- Added checkboxes next to View list items to indicate which are already open
- Added window where users can request new features
- Added About window
- Added new Exchange 'Custombalance' to API Key Manager. CustomBalances are now associated to a particular API key and can be loaded similar to exchanges
- Added AppFeedback when PC is offline (internet connectivity down) and we expectedly receive errors
- Fixed FTX bug where UPnL wasn't updating after PC sleep
- Fixed position grouping on minimal view