Per-mod output, packaging script, fix requiredAddons CfgPatches names

- Split single config.cpp into per-mod output/<mod>/config.cpp files
- Use original CfgPatches class names (not sanitized folders) in requiredAddons
- Skip 'unknown' source_mod from requiredAddons
- Add scripts/package_mod.py with armake2 PBO packing
- Add package_mod.ini for configurable mod packaging
- Use {} array syntax instead of [] for Arma config compatibility

package_mod.ini

@@ -0,0 +1,11 @@
+[mod]
+mod_name = A3Rebalancer
+mod_display_name = A3 Rebalancer
+mod_description = Normalizes non-RHS ammo and armor values to RHS baseline.
+mod_author = REDCODE
+mod_version = 1.0
+
+[paths]
+; Arma 3 user mods folder (where @mod folders go)
+; Windows default: Documents\Arma 3\!mods
+arma_mods_dir = C:\Users\REDCODE\Documents\Arma 3\!mods