Make set_power_configuration use refactored cfg stuff

[PieterVdc]

No description provided.

[Copilot]

Pull request overview

This PR refactors power configuration updates to use the shared named-field config infrastructure, bringing SET_POWER_CONFIGURATION closer to the existing room/trap/effect-generator config paths and exposing the same capability to Lua.

Changes:

• Replaced the bespoke SET_POWER_CONFIGURATION script parsing/processing code with set_config_check / set_config_process using magic_powers_named_fields_set.
• Added and registered the Lua SetPowerConfiguration binding and updated the Lua binding stub.
• Converted power POWER / COST parsing in config_magic.c to custom named-field handlers and moved spell-tab refresh into update_powers_tab_to_config().

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/lvl_script_commands.c	Swaps power script handling over to the generic named-field config helpers.
src/lua_api.c	Adds the Lua-facing SetPowerConfiguration entry point and registers it globally.
src/frontmenu_ingame_tabs.c	Makes power-tab refresh also reopen the active spell menu, matching room/trap refresh behavior.
src/config_magic.h	Exports the power named-field set for shared use.
src/config_magic.c	Removes the old power command table and adds named-field parsing/assignment for power config values.
config/fxdata/lua/bindings/config.lua	Publishes the Lua binding stub for SetPowerConfiguration.

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