docs: add Elgato Control Center, Studio, and Wave Link 3 sub-actions (#433)

Author: Mustached-Maniac

streamerbot/3.api/1.sub-actions/elgato/control-center/assets/set-brightness.png

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+---
+title: Set Power State
+description: Set the power state of the selected device in Elgato Control Center
+version: 1.1.0
+parameters:
+  - name: Device
+    type: Select
+    required: true
+    description: Device to set the power state for
+  - name: Brightness
+    type: number
+    required: true
+    description: Brightness level for the device
+    minimum: 0
+    maximum: 100
+---

streamerbot/3.api/1.sub-actions/elgato/control-center/assets/set-power-state.png

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+---
+title: Set Power State
+description: Set the power state of the selected device in Elgato Control Center
+version: 1.1.0
+parameters:
+  - name: Device
+    type: Select
+    required: true
+    description: Device to set the power state for
+  - name: State
+    type: Select
+    required: true
+    description: Power state for the device
+    options:
+      - Off
+      - On
+      - Toggle
+---

streamerbot/3.api/1.sub-actions/elgato/control-center/assets/set-temperature.png

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+---
+title: Set Temperature
+description: Set the temperature of the selected device in Elgato Control Center
+version: 1.1.0
+parameters:
+  - name: Device
+    type: Select
+    required: true
+    description: Device to set the temperature for
+  - name: Temperature
+    type: number
+    required: true
+    description: Temperature level for the device
+---

streamerbot/3.api/1.sub-actions/elgato/control-center/brightness/set-brightness.md

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+---
+title: Open Storage Location
+description: Open the storage location of the Elgato Studio application
+version: 1.1.0
+---

streamerbot/3.api/1.sub-actions/elgato/control-center/power/set-power-state.md

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+---
+title: Get Preview Info
+description: Retrieve information about the current preview in Elgato Studio
+version: 1.1.0
+---

streamerbot/3.api/1.sub-actions/elgato/control-center/temperature/set-temperature.md

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+---
+title: Set Preview Fullscreen State
+description: Set the fullscreen state of the current preview in Elgato Studio
+version: 1.1.0
+parameters:
+  - name: State
+    type: Select
+    required: true
+    description: Fullscreen state for the preview
+    options:
+      - Enabled
+      - Disabled
+---