Add FootstepGfx and JumpGfxComponent; implement particle effects for footsteps and jumps

objects/fxs/bounce_gfx.tscn

@@ -0,0 +1,39 @@
+[gd_scene load_steps=6 format=3 uid="uid://qo2ngbnkix85"]
+
+[sub_resource type="Gradient" id="Gradient_qxp43"]
+offsets = PackedFloat32Array(0, 0.289256, 0.790634)
+colors = PackedColorArray(0.635294, 1, 0.952941, 1, 0.380392, 0.827451, 0.890196, 1, 0.188235, 0.317647, 0.509804, 1)
+
+[sub_resource type="GradientTexture1D" id="GradientTexture1D_1jx8o"]
+gradient = SubResource("Gradient_qxp43")
+use_hdr = true
+
+[sub_resource type="Curve" id="Curve_8fwqm"]
+_data = [Vector2(0.251928, 1), 0.0, -3.43942, 0, 0, Vector2(1, 0.340954), 0.0, 0.0, 0, 0]
+point_count = 2
+
+[sub_resource type="CurveTexture" id="CurveTexture_365fl"]
+curve = SubResource("Curve_8fwqm")
+
+[sub_resource type="ParticleProcessMaterial" id="ParticleProcessMaterial_wfuta"]
+particle_flag_disable_z = true
+emission_shape = 3
+emission_box_extents = Vector3(10, 1, 1)
+angle_min = -45.0
+angle_max = 45.0
+direction = Vector3(0, 1, 0)
+spread = 15.0
+initial_velocity_min = 5.0
+initial_velocity_max = 10.0
+gravity = Vector3(0, 98, 0)
+scale_curve = SubResource("CurveTexture_365fl")
+color_ramp = SubResource("GradientTexture1D_1jx8o")
+
+[node name="BounceGFX" type="GPUParticles2D"]
+emitting = false
+amount = 52
+one_shot = true
+explosiveness = 1.0
+fixed_fps = 24
+collision_base_size = 3.32
+process_material = SubResource("ParticleProcessMaterial_wfuta")