Bionic battery power overhaul

[zaimoni]

3f74e38d0ff96b3d99532fdcc0b272e84ae16374 eliminated an inlined (wrong) description for the C:Whales battery power storage in favor of the configured description.

• player::max_power_level is a cache field. Eliminating this from the savefile is a high-risk commit.
• The current batteries bionic storage is the only bionic that can be multiply installed -- and it provides only four max power per instance. Consider migrating the following from C:Bright Nights (some bionics will need rescaling to account for the changes in maximum power)

From Bright Nights: { "id": "bio_power_storage", "copy-from": "bionic_general_npc_usable", "type": "BIONIC_ITEM", "name": { "str": "Power Storage CBM" }, "looks_like": "bio_int_enhancer", "description": "A Compact Bionics Module that upgrades the user's power capacity by 100 units. Having at least one of these is a prerequisite to using powered bionics. The user will also need a power supply, found in various CBMs.", "price": 380000, "weight": "70 g", "difficulty": 1 }, { "id": "bio_power_storage_mkII", "copy-from": "bionic_general_npc_usable", "type": "BIONIC_ITEM", "name": { "str_sp": "Power Storage CBM Mk. II" }, "looks_like": "bio_int_enhancer", "description": "A Compact Bionics Module developed at DoubleTech Industries as a replacement for the highly successful Power Storage CBM. Increases the user's power capacity by 250 units.", "price": 1000000, "weight": "50 g", "difficulty": 1 },

[zaimoni]

Somewhat more invasive than expected; I missed that the relevant bionic is elided (i.e., it's not actually in the savefile).