simulation organization and cleanup

- new modules/simulation directory to collect all simulators and related modules
 - new Tools/simulation directory to collect and organize scattered simulation submodules, scripts, etc
 - simulation module renamed to simulator_mavlink
 - sih renamed to simulator_sih (not a great name, but I wanted to be clear it was a simulator)
 - ignition_simulator renamed to simulator_ignition_bridge
 - large sitl_target.cmake split by simulation option and in some cases pushed to appropriate modules
 - sitl targets broken down to what's actually available (eg jmavsim only has 1 model and 1 world)
 - new Gazebo consistently referred to as Ignition for now (probably the least confusing thing until we fully drop Gazebo classic support someday)

posix-configs/bbblue/px4.config

@@ -6,7 +6,7 @@
 # config for a quad
 # modified from ../rpi/px4.config
 
-param select eeprom/parameters
+param select parameters.bson
 param import
 
 param set CBRK_SUPPLY_CHK 894281

posix-configs/bbblue/px4_fw.config

@@ -6,7 +6,7 @@
 # config for fixed wing (FW)
 # modified from ./px4.config, switch att/pos_control & mixer
 
-param select eeprom/parameters
+param select parameters.bson
 param import
 
 param set CBRK_SUPPLY_CHK 894281