Create Big Cannons: Equally Opposite

"CLEAR THE DECK OR TURN TO JELLY!"

Changes:

• Firing a cannon or autocannon now produces a spherical shockwave and a jet of hot gas originating from the muzzle.
• Shockwaves & gas jets deal damage and forces to entities & sublevels.
• New death messages have been added: Being incinerated by standing in front of the cannon at a close range; Getting obliterated by the gas jet by standing in front of the cannon beyond the incineration range; Having your organs liquefied with a shockwave by standing too close to the cannon when it fires.
• Sable physics objects are affected by shockwaves.
• Blocks and Sable physics objects can shield you from shockwaves and gas jets.
• Shockwaves reflect off of blocks and sublevels, making the firing of a cannon in an enclosed space hazardous for the well-being of anything within the space.
• Entity damage caused by shockwaves & gas jets is enabled by default in the config, but can be turned off in the config by setting disableMuzzleBlast = false or by using the /gamerule cannonBlastDamage false command in-game to for a specific world.