Big fixes!

ChangeLog:

• Fixed several gameplay annoyances (low stick drop rate from leaves, constant requirement of millet fiber for flint and steel, etc.);
• Refined numerous configurations (temperature, structure generation, and more);
• Major optimization improvements for smoother performance;
• Minor adjustments to the modlist;
• Fixed all identified bugs in quests and crafting recipes;
• Added new quests and recipes;
• And much more!