Added hooks and models (space-ros#46)

custom_gz_plugins/hooks/simulation.dsv.in

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+prepend-non-duplicate;IGN_GAZEBO_RESOURCE_PATH;share
+prepend-non-duplicate;IGN_GAZEBO_RESOURCE_PATH;share/simulation/models

custom_gz_plugins/models/dust_storm/model.config

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+<?xml version="1.0"?>
+
+<model>
+  <name>Dust Storm</name>
+  <version>1.0</version>
+  <sdf version="1.6">model.sdf</sdf>
+
+  <author>
+    <name>Naman Malik</name>
+    <email>[email protected]</email>
+  </author>
+
+  <description>
+    A Configurable particle_emitter that produces brown particles to create a 
+    Dust like effect.
+    The Dust Emitter can be configured using the Dust Control GUI plugin.
+    Parameters that can be configured:
+    - Volume of emitter (x, y, z)
+    - Position (x, y, z)
+    - Dust Density
+    - Dust Velocity
+    - Dust Angle
+  </description>
+</model>

custom_gz_plugins/models/dust_storm/model.sdf

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+<?xml version="1.0" ?>
+<sdf version="1.6">
+
+<plugin name='gz::sim::systems::ParticleEmitter' filename='gz-sim-particle-emitter-system'/>
+
+
+<model name="dust_storm">
+    <static>true</static>
+    <pose>-10 0 0 0 0 0</pose>
+    <link name="dust_link">
+    <visual name="visual">
+      <geometry>
+        <box>
+          <size>0.1 0.1 0.1</size>
+        </box>
+      </geometry>
+    </visual>
+    <particle_emitter name="emitter" type="box">
+      <emitting>true</emitting>
+      <size>30 1 1</size>
+      <particle_size>0.1 0.1 0.1</particle_size>
+      <lifetime>30</lifetime>
+      <min_velocity>1.8</min_velocity>
+      <max_velocity>1.8</max_velocity>
+      <scale_rate>1.5</scale_rate>
+      <rate>10</rate>
+      <material>
+        <diffuse>1 1 1</diffuse>
+        <specular>1.0 1.0 1.0</specular>
+        <pbr>
+          <metal>
+            <albedo_map>materials/textures/dust.png</albedo_map>
+          </metal>
+        </pbr>
+      </material>
+    </particle_emitter>
+  </link>
+</model>
+
+</sdf>

custom_gz_plugins/models/light_dust_storm/model.config

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+<?xml version="1.0"?>
+
+<model>
+  <name>Light Dust Storm</name>
+  <version>1.0</version>
+  <sdf version="1.6">model.sdf</sdf>
+
+  <author>
+    <name>Naman Malik</name>
+    <email>[email protected]</email>
+  </author>
+
+  <description>
+    A Configurable particle_emitter that produces brown particles to create a 
+    Dust like effect.
+    The Dust Emitter can be configured using the Dust Control GUI plugin.
+    Parameters that can be configured:
+    - Volume of emitter (x, y, z)
+    - Position (x, y, z)
+    - Dust Density
+    - Dust Velocity
+    - Dust Angle
+  </description>
+</model>

custom_gz_plugins/models/light_dust_storm/model.sdf

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+<?xml version="1.0" ?>
+<sdf version="1.6">
+
+<plugin name='gz::sim::systems::ParticleEmitter2' filename='gz-sim-particle-emitter2-system'/>
+
+
+<model name="light_dust_storm">
+  <static>true</static>
+  <pose>-10 0 0 0 0 0</pose>
+  <link name="dust_link">
+    <visual name="visual">
+      <geometry>
+        <box>
+          <size>0.1 0.1 0.1</size>
+        </box>
+      </geometry>
+    </visual>
+    <particle_emitter name="emitter" type="box">
+      <emitting>true</emitting>
+      <size>30 1 1</size>
+      <particle_size>0.1 0.1 0.1</particle_size>
+      <lifetime>30</lifetime>
+      <min_velocity>0.6</min_velocity>
+      <max_velocity>3</max_velocity>
+      <scale_rate>1</scale_rate>
+      <rate>3</rate>
+      <material>
+        <diffuse>1 1 1</diffuse>
+        <specular>1.0 1.0 1.0</specular>
+        <pbr>
+          <metal>
+            <albedo_map>materials/textures/Dust.png</albedo_map>
+          </metal>
+        </pbr>
+      </material>
+      <color_range_image>materials/textures/DustColors.png</color_range_image>
+    </particle_emitter>
+  </link>
+</model>
+
+</sdf>

custom_gz_plugins/models/sun_sphere/model.sdf

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+<?xml version='1.0'?>
+<sdf version="1.5">
+  <model name="sun">
+  <static>true</static>
+    <pose>0 0 0 0 0 0</pose>
+    <link name="link">
+      <visual name="visual">
+        <cast_shadows>false</cast_shadows>
+        <geometry>
+          <sphere>
+            <radius>2.0</radius>
+          </sphere>
+        </geometry>
+        <material>
+          <lighting>1</lighting>
+          <ambient>1 1 0.7 1</ambient>
+          <diffuse>1 1 0.7 1</diffuse>
+          <specular>1 1 1 1</specular>
+          <emissive>1 1 0.5 1</emissive>
+        </material>
+      </visual>
+      <light type="directional" name="directional_light">
+        <cast_shadows>true</cast_shadows>
+        <pose>0 0 10 0 0 0</pose>
+        <diffuse>1 1 1 1</diffuse>
+        <specular>1 1 1 1</specular>
+        <attenuation>
+          <range>100</range>
+          <constant>0.9</constant>
+          <linear>0.01</linear>
+          <quadratic>0.001</quadratic>
+        </attenuation>
+        <direction>0 0 -1</direction>
+      </light>
+    </link>
+  </model>
+</sdf>