* [RAPPS] Display custom applications icons for installed applications
- Implement `RetrieveIcon` helper function in `CInstalledApplicationInfo` class, which retrueves the current app's icon from registry, same as it done for `CAvailableApplicationInfo`.
- Use it for loading the icon in `CAppsListView::AddInstalledApplication` function, via `ExtractIconW`. Load default Rapps icon only when the app has no its custom icon.
- Retrieve `DisplayIcon` value from registry in `CInstalledApps::Enum` function, same as other registry values (like app name, description, etc).Store it in `szDisplayIcon` string, which is used in `CInstalledApplicationInfo::RetrieveIcon` for retrieving the data of that value.
- Increase `LISTVIEW_ICON_SIZE` macro from 24 to 32, so 32x32 icon size is now used instead of 24x24. This makes displayed icons more accurate, since most of apps contain 32x32 icon, so they look a bit distorted with 24x24 size.
* [RAPPS] add function to set view-mode
* [RAPPS] move toolbar and searchbar into appview
* [RAPPS] remove settings and exit button from toolbar
* [RAPPS] add code to switch between list and tile mode
* [RAPPS] add auto-arrange for listview
* [RAPPS] adjust the minimum size of AppView
* [RAPPS] now image list of listview is stored inside the class
* [RAPPS] add list mode, and old list-mode are detail mode now
* [RAPPS] add check for unimplemented view mode
* [RAPPS] separate application-view from gui.cpp
* [RAPPS] make the code looks more clear
* [RAPPS] fix & improve tab-order handle
* [RAPPS] now double-click / right-click & install an item will install exactly this app
* [RAPPS] add handling for DWORD timestamp for InstallDate
* [RAPPS] make the code setting column style more clear
* [RAPPS] change the owner of popup-menu
* [RAPPS] now the popup menu (the one when right-click listview) now belongs to application-view
