Add LANCOM devices (#1588)

* Add LANCOM devices

* Fix weight and airflow

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Co-authored-by: Daniel W. Anner <daniel.anner@danstechsupport.com>

device-types/LANCOM/1793VA-4G.yaml

@@ -0,0 +1,38 @@
+---
+manufacturer: LANCOM
+model: 1793VA-4G
+slug: lancom-1793va-4g
+part_number: '62116'
+u_height: 0
+is_full_depth: false
+weight: 520
+weight_unit: g
+comments: '[LANCOM 1793VA-4G Data sheet](https://www.lancom-systems.de/download/LC-1793VA-4G/DS_1793VA-4G_DE.pdf)'
+power-ports:
+  - name: PS1
+    type: dc-terminal
+    maximum_draw: 18
+interfaces:
+  - name: ETH-1
+    type: 1000base-t
+  - name: ETH-2
+    type: 1000base-t
+  - name: ETH-3
+    type: 1000base-t
+  - name: ETH-4
+    type: 1000base-t
+  - name: VDSL/ADSL
+    type: xdsl
+  - name: Analog 2/4
+    type: other
+  - name: Analog 1/3
+    type: other
+  - name: ISDN 1
+    type: 1000base-t
+  - name: ISDN 2
+    type: 1000base-t
+  - name: Cellular Interface (LTE)
+    type: lte
+console-ports:
+  - name: com
+    type: mini-din-8

device-types/LANCOM/730-4G-plus.yaml

@@ -0,0 +1,22 @@
+---
+manufacturer: LANCOM
+model: 730-4G+
+slug: lancom-730-4g-plus
+part_number: '61705'
+u_height: 0
+is_full_depth: false
+airflow: passive
+weight: 500
+weight_unit: g
+comments: '[LANCOM 730-4G+ Data Sheet](https://www.lancom-systems.de/fileadmin/download/LC-730-4G-plus/DS_730-4G-plus_DE.pdf)'
+power-ports:
+  - name: PS1
+    type: dc-terminal
+interfaces:
+  - name: ETH-1
+    type: 1000base-t
+  - name: Cellular Interface (LTE)
+    type: lte
+console-ports:
+  - name: com
+    type: mini-din-8

device-types/LANCOM/LN-830E.yaml

@@ -0,0 +1,27 @@
+---
+manufacturer: LANCOM
+model: LN-830E
+slug: lancom-ln-830e
+part_number: '61747'
+u_height: 0
+is_full_depth: false
+airflow: passive
+weight: 1.5
+weight_unit: kg
+comments: '[LANCOM LN-830E Data sheet](https://my.lancom-systems.de/download/documentation/hardware/?id=7d727fda5f49452344fa706eb9188d68&file=/DS_LN-830E_DE.pdf)'
+power-ports:
+  - name: PS1
+    type: dc-terminal
+    maximum_draw: 11
+interfaces:
+  - name: ETH-1
+    type: 1000base-t
+  - name: ETH-2
+    type: 1000base-t
+  - name: WLAN-1
+    type: ieee802.11n
+  - name: WLAN-2
+    type: ieee802.11ac
+console-ports:
+  - name: com
+    type: mini-din-8