Signed Paintings

backport of recent changes:

• fixed crash with stendhal
• added disclaimer message when using a url with an invalid format (eg .webp), or an image without a format
• fixed crash when loading after using versions 1.1.5 or 1.1.6 of the mod
• fixed specific circumstance where default trusted domains wouldnt be set
• images-ext-1.discordapp.net/external/ links should now always load correctly
• url aliases now configurable
• fixed config file creation not working
• fixed crash with litematica
• standing signs now default their painting alignment to center top, placing the painting nicely on the floor
• selected alignment button is now darkened
• vram check now only runs every minute instead of every frame