Added PopcornFX as a submodule, pointing to dev branch

Signed-off-by: Olex Lozitskiy <[email protected]>

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "Gems/O3DEPopcornFXPlugin"]
+	path = Gems/O3DEPopcornFXPlugin
+	url = https://github.com/PopcornFX/O3DEPopcornFXPlugin

Gems/O3DEPopcornFXPlugin

@@ -0,0 +1 @@
+Subproject commit 35d84c6f02a2eda22f26485e1af75de6225384fc

Gems/gem.json

@@ -22,7 +22,8 @@
         "level_art_mps",
         "particlefx_mps",
         "pbr_material_pack_mps",
-        "props_mps"
+        "props_mps",
+        "O3DEPopcornFXPlugin"
     ],
     "dependencies": [
         "character_mps",
@@ -31,6 +32,7 @@
         "level_art_mps",
         "particlefx_mps",
         "pbr_material_pack_mps",
-        "props_mps"
+        "props_mps",
+        "PopcornFX"
     ]
 }