Rebrand as BCx-modern, a 1.7.10 port of BCx

Position this mod as a port of BCx from the Minecraft 1.2.5 era.

- Rename the mod to BCx-modern (modid bcxmodern) and the package to
  net.kanawo.bcxmodern; the main class is now BCxModern and takes its
  version from Tags.VERSION.
- Move assets to assets/bcxmodern and rename the lang key and EMC save
  data to match.
- Fill in mcmod.info (description, author agomizi1cm, credits,
  dependencies) and the LICENSE copyright holder.
- Add a README.
- Remove template leftovers: CODEOWNERS, LICENSE-template, the greeting
  Config, template comments, empty event handlers and the commented-out
  NEI dependency.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

gradle.properties

@@ -3,15 +3,15 @@
 gtnh.settings.blowdryerTag = 0.2.2
 
 # Human-readable mod name, available for mcmod.info population.
-modName = EMCBuilder
+modName = BCx-modern
 
 # Case-sensitive identifier string, available for mcmod.info population and used for automatic mixin JSON generation.
 # Conventionally lowercase.
-modId = emcbuilder
+modId = bcxmodern
 
 # Root package of the mod, used to find various classes in other properties,
 # mcmod.info substitution, enabling assertions in run tasks, etc.
-modGroup = net.kanawo.emcbuilder
+modGroup = net.kanawo.bcxmodern
 
 # Whether to use modGroup as the maven publishing group.
 # When false, com.github.GTNewHorizons is used.
@@ -74,7 +74,7 @@ enableGenericInjection = true
 # Generate a class with a String field for the mod version named as defined below.
 # If generateGradleTokenClass is empty or not missing, no such class will be generated.
 # If gradleTokenVersion is empty or missing, the field will not be present in the class.
-generateGradleTokenClass = net.kanawo.emcbuilder.Tags
+generateGradleTokenClass = net.kanawo.bcxmodern.Tags
 
 # Name of the token containing the project's current version to generate/replace.
 gradleTokenVersion = VERSION