Add mcpelauncher install script (Minecraft: Bedrock Edition launcher)

[devin-ai-integration]

Summary

Adds a new RetroPie-Extra ports scriptmodule that builds the client from minecraft-linux/mcpelauncher-manifest (the unofficial Minecraft: Bedrock Edition launcher) from source and registers it as a port.

The script follows the standard RetroPie scriptmodule format (depends/sources/build/install/configure functions, rp_module_* headers, getDepends/gitPullOrClone/addPort helpers). gitPullOrClone clones with --recursive, which pulls the manifest's many submodules needed for the build.

Build/install specifics:

• Builds only the client (-DBUILD_UI=OFF) to avoid the Qt dependency chain, uses the system libcurl (-DUSE_OWN_CURL=OFF), and disables source-tree dev paths (-DENABLE_DEV_PATHS=OFF) for a clean packaged install.
• Uses the upstream make install target (-DCMAKE_INSTALL_PREFIX="$md_inst"), which places bin/mcpelauncher-client and the bundled native libs under share/mcpelauncher.
• configure writes a small mcpelauncher.sh wrapper that invokes the client with --game-dir/--data-dir/--cache-dir pointing at $romdir/ports/mcpelauncher/game and the user's config/cache dirs, then addPorts it.

Minecraft is not free/redistributable, so no game data is downloaded. rp_module_help instructs the user to extract their own Bedrock APK (AndroidManifest.xml, assets/, lib/) into $romdir/ports/mcpelauncher/game.

rp_module_flags="!all rpi4 rpi5 x86_64" — excluded from --all and limited to platforms with the required OpenGL ES support.

Also adds the entry to the ports list in README.md, marked untested.

Note: I have not been able to run a full build/install on target RetroPie hardware, so the script is listed as untested.

Link to Devin session: https://app.devin.ai/sessions/2b40522a36664ce3a5d0a7afa941df98
Requested by: @Exarkuniv

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