Version 0.6.0 code cleanup, documentation, localization

[Daedeross]

Final cleanup and testing for version 0.6.0.

Functions to cleanup and document

Building

• [x] add_hidden_radar (removed)
• [x] add_radar_proxy
• [x] remove_power_proxy
• [x] remove_hidden_radars (removed)

  Generation

• [x] on_chunk_charted

  Player

• [x] get_adjacent_surfaces
• [x] get_all_subterra_surfaces
• [x] get_player_level
• [x] on_player_cursor_stack_changed

  Technology

• [x] underground_building_researched
• [x] underground_radars_researched
• [x] update_radar_proxies

  UI

• [x] display_level
• [x] do_player_drawing
• [x] draw_nearby_boxes

  Updates

• [x] update_power
• [x] update_radars

Localization (EN)

Entities

• [x] subterra-power-in
• [x] subterra-power-out
• [x] subterra-power-column
• [x] subterra-power-pole

  Settings

• [x] subterra-blacklist
• [x] subterra-show-build-hud
• [x] subterra-build-hud-radius
• [x] subterra-radar-update-chunk-size
• [x] subterra-type-whitelist

Regression Tests

• [x] New world.
• [x] In-progress world (v0.5.3)
• [x] Fully researched world (v0.5.3)
• [x] Fully researched world w/o Subterra

[Daedeross]

Finished with PR #27