NPC followers cannot gain experience from reading or camp tasks

# Describe the bug

Followers are unable to increase their skills, making it entirely reliant on RNG to give you a follower that can accomplish camp tasks.

# Steps To Reproduce

1. Ask an NPC about their abilities to see the base level.
2. Send them on a task that would increase their level, such as crafting or reading.(Book and Task were Pointy Stick crafting and reading Birdhouse Monthly)
3. Ask again, see 0% gain.

# Expected behavior

Follower gain experience for their skills.

# Screenshots

# Versions and configuration

- OS: Windows
- OS Version: 10.0 1909
- Game Version: 0.E-8366-gafe3659 [64-bit]
- Graphics Version: Tiles
- Game Language: System language []
- Mods loaded: [
Dark Days Ahead [dda],
Aftershock [aftershock],
Blaze Industries [blazeindustries],
C.R.I.T Expansion Mod [crt_expansion],
Magiclysm [magiclysm],
Bionic Professions [package_bionic_professions],
DinoMod [DinoMod],
Alternative Map Key [alt_map_key],
Mythical Martial Arts [MMA],
Fuji's Military Profession Pack [fuji_mpp],
Stats Through Kills [stats_through_kills],
SpeedyDex [speedydex],
Disable NPC Needs [no_npc_food]
]

# Additional context

Start by reproducing the issue using the listed steps: check an NPC's abilities, assign Pointy Stick crafting or Birdhouse Monthly reading, and check the abilities again. Compare the observed 0% gain with the expected behavior that followers gain skill experience; no source files or tests are identified in the issue.

Written by the indexing model from the issue text.