Drop any resource pack into the content folder

• New: drop a resource pack .zip into plugins/RPEngine/content/ and run /rp reload. It is unpacked into a folder of its own, the zip is moved to unpacked-zips/, and the whole pack ships to your players inside RP Engine's: shaders, overlays, every namespace including minecraft, its pack.png, its filter and its custom languages. A pack you unzipped yourself works too, as long as pack.mcmeta and assets/ are at the top of the folder. See Adding a resource pack.
• A pack's resourcepack/ folder now also carries its pack.mcmeta's filter and language sections into the built pack.
• Fixed: text drawn after an icon with a transparent right edge in a HUD landed a few pixels short, and moved whenever the icon changed frame.
• Fixed: a dialog glyph chosen by a placeholder lost its colours and came out white.
• Fixed: an addon update that stopped shipping a file could leave the old one behind and break that addon's dialogs; deleting a file to get the new one now works after a restart.