Update 'disable fire' documentation in conf.example

Rename in game.conf and documentation
Update game_api.txt documentation for bucket API and tree functions
Fix tab, space and comment formatting in game_api.txt
Rename in mod READMEs

Add option to disable bed's night skip - Solve second point of #512 by adding a setting, `enable_bed_night_skip` , with default value of `true`.

Make replace ABM optional, disabled by default