Respackopts

Commits in beta 2.9.0:

• 1.18 proper
• Update for new build script
• Use new CI scripts
• Use the data location of a pack instead of its id internally. Might fix conflicts between multiple instances of the same pack
• rc1, work around a known bug with fabulous shaders
• Fix an issue from the previous commit and support built-in conditions
• Save pack configs in the packs directory (SomePack.zip -> SomePack.zip.rpo) if possible, needs testing
• Port to 1.18 and include ModMenu icon, closes #17
• Move some stuff around again
• jdk17, explicitly depend on loader 0.12.0
• Attempt to fix table in Shaders.md