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>

dependencies.gradle

@@ -34,8 +34,6 @@
  * For more details, see https://docs.gradle.org/8.0.1/userguide/java_library_plugin.html#sec:java_library_configurations_graph
  */
 dependencies {
-    //runtimeOnlyNonPublishable("com.github.GTNewHorizons:NotEnoughItems:2.7.69-GTNH:dev")
-
     // Local deobfuscated (MCP-named) dev jars placed in libs/:
     //  - BuildCraft 7.1.27 (gradlew deobfJar -> buildcraft-7.1.27-dev.jar)
     //  - FMProjectE (gradlew jar -> FMProjectE-*-dev.jar)