Remove the Salva integration code from rapier + add a plugin system to the testbed.

build/rapier2d/Cargo.toml

@@ -23,7 +23,6 @@ simd-is-enabled = [ ]
 wasm-bindgen = [ "instant/wasm-bindgen" ]
 serde-serialize = [ "erased-serde", "nalgebra/serde-serialize", "ncollide2d/serde-serialize", "serde", "generational-arena/serde", "bit-vec/serde", "arrayvec/serde" ]
 enhanced-determinism = [ "simba/libm_force", "indexmap" ]
-fluids = [ "salva2d" ]
 
 [lib]
 name = "rapier2d"
@@ -51,7 +50,6 @@ indexmap = { version = "1", features = [ "serde-1" ], optional = true }
 downcast-rs = "1.2"
 num-derive = "0.3"
 bitflags = "1"
-salva2d = { version = "0.4", optional = true }
 
 [dev-dependencies]
 bincode = "1"

build/rapier3d/Cargo.toml

@@ -23,7 +23,6 @@ simd-is-enabled = [ ]
 wasm-bindgen = [ "instant/wasm-bindgen" ]
 serde-serialize = [ "erased-serde", "nalgebra/serde-serialize", "ncollide3d/serde-serialize", "serde", "generational-arena/serde", "bit-vec/serde" ]
 enhanced-determinism = [ "simba/libm_force", "indexmap" ]
-fluids = [ "salva3d" ]
 
 [lib]
 name = "rapier3d"
@@ -51,7 +50,6 @@ indexmap = { version = "1", features = [ "serde-1" ], optional = true }
 downcast-rs = "1.2"
 num-derive = "0.3"
 bitflags = "1"
-salva3d = { version = "0.4", optional = true }
 
 [dev-dependencies]
 bincode = "1"

build/rapier_testbed2d/Cargo.toml

@@ -39,7 +39,6 @@ flexbuffers = "0.1"
 Inflector  = "0.11"
 md5 = "0.7"
 
-
 [dependencies.rapier2d]
 path = "../rapier2d"
 version = "0.3"