stonecutter: setup project for multiversion support

- Switch to Stonecutter build system
- Migrate mappings to Mojmap

versions/1.20.1-fabric/gradle.properties

@@ -0,0 +1,12 @@
+mod.mc_dep_fabric==1.20.1
+mod.mc_dep_forgelike=[1.20, 1.20.1]
+mod.mc_title=1.20.1
+mod.mc_targets=1.20.1
+
+deps.forge_loader=47.3.0
+deps.neoforge_loader=[UNSUPPORTED]
+
+deps.fabric_version=0.92.3+1.20.1
+deps.modmenu_version=7.2.2
+
+loom.platform=fabric