Update shaxthal_drone_surface palette from AtS
Add additional Shaxthal drone palettes from AtS
Add crystal shard item and icon from AtS
Add barrier glyph image and macro from AtS
Remove old Fire Faerie baseframe and replace with the new one
Add OBJECTIVE_NOTE_SHOW_IF macro
S9: New storyscreen text
S9: New map
Add character definition/recall macros for Igor
S9: New scenario code and prose
Add cave water drip ambience sound effects from Frogatto

Sounds by Adam Rinsky (ActionJack), licensed under CC-0. The original
PCM files can be found in the Frogatto repository.

Used by the SOUND_LIST:CAVE_DRIP macro.
Add SOUND_LIST:CAVE_DRIP macro from AtS
Add CAVE_WATER_SOUND_SOURCE macro from AtS
Add cave background noise ambience from Frogatto

Sound by Jetrel, licensed under CC-0. The original version is in the
Frogatto repository; this one is actually slightly edited to make the
loop actually seamless.
Add BACKGROUND_SOUND_SOURCE_GENERIC macro from AtS
Add CAVE_NOISE_SOUND_SOURCE macro from AtS
Remove unused VICTORY_MUSIC macro
Remove unused LOOP_SOUND macro
Balancing changes for the Leech unit type

 * Changed Leech's alignment from 'lawful' to 'neutral'.
 * Decreased Leech's HP from 62 to 42.
 * Decreased Leech's melee damage from 11-2 to 9-2.
 * Decreased Leech's unit level from 3 to 1.
S8x: Make the Elvish Marksman an Archer, and rename her Unidë