Switch Homebrew Menu v3.0.0

Features
* Added message boxes. The envGetLastLoadResult() output is now displayed during startup if needed (error returned by the application which ran last).
* Added nxlink support (netloader).
* * The Switch IP address can automatically be determined via UDP broadcast.
* * Netloader is handled on a seperate thread with non-blocking sockets. UI drawing is not blocked during the transfer.
* * The transfer can be aborted via 'Back' input.
* * If the transfer stopped without finishing, the file is deleted.
* * When returning to the main-menu from netloader, the menu is reloaded since the netloader NRO may have been deleted due to the transfer stopping.
* * Netloader status is displayed in a message-box while netloader is active. This include transfer progress and a progress-bar.
* * Fixed buffer overflow vuln with netloader args introduced with the original netloader commit (nothing useful which could cause a crash can be overwritten with an unmodifed nxlink). Fixed unrelated bounds check in launchAddArg() which broke once nxlink_host support was added.
* Use system shared-font. Note that the system language is still not used.
* Added touch-controls.
* Added support for themes loaded from SD. If the system theme is not recognized, the used theme will default to the dark theme.
* Added Theme Menu for selecting the used theme, including the default theme.
* Enabled time display, which uses local-time.
* The battery/charging status is now displayed.
* Added support for file-associations.

Other
* Replaced nanojpeg with libjpeg-turbo. See README regarding this.
* The switch/ directory is created if it doesn't exist. Config dirs on SD are now automatically created during startup if needed.
* Display an error screen with print-console instead of using fatalSimple, for errors during startup. Display a message-box in launchFile() for app-launching when an error occurs instead of using fatalSimple.
* Use applet exit-locking.
* Assets are now loaded from a .zip in RomFS instead of embedding it in data/.
* Built with libnx stable v1.5.0.
* Further improvements to overall system stability and other minor adjustments to enhance the user experience.