use Röntgen icon for more presets and field-values

presets:
* Diving Platform
* City Limit Sign
* Turning Loop

fields values:
* `design` field of Power Poles and Power Towers/Portals
* `leaf_type`
* `traffic_calming`
* `volcano:type` and `volcano:status`
* `tower:construction`

data/fields/design_power_pole.json

@@ -0,0 +1,18 @@
+{
+    "key": "design",
+    "type": "combo",
+    "label": "{design}",
+    "icons": {
+        "one-level": "roentgen-power_pole_1_level",
+        "two-level": "roentgen-power_pole_2_level",
+        "three-level": "roentgen-power_pole_3_level",
+        "four-level": "roentgen-power_pole_4_level",
+        "asymmetric": "roentgen-power_pole_asymmetric",
+        "triangle": "roentgen-power_pole_triangle",
+        "flag": "roentgen-power_pole_flag",
+        "delta": "roentgen-power_pole_delta",
+        "armless": "roentgen-power_pole_armless",
+        "armless_asymmetric": "roentgen-power_pole_asymmetric_armless",
+        "armless_triangle": "roentgen-power_pole_triangle_armless"
+    }
+}

data/fields/design_power_tower.json

@@ -0,0 +1,27 @@
+{
+    "key": "design",
+    "type": "combo",
+    "label": "{design}",
+    "icons": {
+        "one-level": "roentgen-power_tower_1_level",
+        "two-level": "roentgen-power_tower_2_level",
+        "three-level": "roentgen-power_tower_3_level",
+        "four-level": "roentgen-power_tower_4_level",
+        "asymmetric": "roentgen-power_tower_asymmetric",
+        "triangle": "roentgen-power_tower_triangle",
+        "flag": "roentgen-power_tower_flag",
+        "delta": "roentgen-power_tower_delta",
+        "delta_two-level": "roentgen-power_tower_delta_2_level",
+        "delta_tree-level": "roentgen-power_tower_delta_3_level",
+        "donau": "roentgen-power_tower_donau",
+        "barrel": "roentgen-power_tower_barrel",
+        "x-frame": "roentgen-power_tower_x_frame",
+        "y-frame": "roentgen-power_tower_y_frame",
+        "h-frame": "roentgen-power_tower_h_frame",
+        "h-frame_two-level": "roentgen-power_tower_h_frame_2_level",
+        "guyed_h-frame": "roentgen-power_tower_guyed_h_frame",
+        "portal": "roentgen-power_tower_portal",
+        "portal_two-level": "roentgen-power_tower_portal_2_level",
+        "portal_three-level": "roentgen-power_tower_portal_3_level"
+    }
+}

data/fields/leaf_type.json

@@ -10,6 +10,10 @@
             "leafless": "Leafless"
         }
     },
+    "icons": {
+        "broadleaved": "roentgen-tree",
+        "needleleaved": "roentgen-needleleaved_tree"
+    },
     "autoSuggestions": false,
     "customValues": false
 }

data/fields/leaf_type_singular.json

@@ -3,6 +3,7 @@
     "type": "combo",
     "label": "Leaf Type",
     "stringsCrossReference": "{leaf_type}",
+    "iconsCrossReference": "{leaf_type}",
     "options": [
         "broadleaved",
         "needleleaved",

data/fields/tower/construction.json

@@ -2,5 +2,11 @@
     "key": "tower:construction",
     "type": "combo",
     "label": "Construction",
-    "placeholder": "Guyed, Lattice, Concealed, ..."
+    "placeholder": "Guyed, Lattice, Concealed, ...",
+    "icons": {
+        "freestanding": "roentgen-tube",
+        "guyed_lattice": "roentgen-lattice_guyed",
+        "guyed_tube": "roentgen-tube_guyed",
+        "lattice": "roentgen-lattice"
+    }
 }

data/fields/traffic_calming.json

@@ -23,5 +23,15 @@
             "rumble_strip": "Rumble Strip",
             "table": "Speed Table"
         }
+    },
+    "icons": {
+        "bump": "roentgen-bump",
+        "cushion": "roentgen-traffic_cushion",
+        "dip": "roentgen-dip",
+        "double_dip": "roentgen-double_dip",
+        "hump": "roentgen-hump",
+        "mini_bumps": "roentgen-mini_bumps",
+        "rumble_strip": "roentgen-rumble_strip",
+        "table": "roentgen-traffic_table"
     }
 }

data/fields/volcano/status.json

@@ -9,6 +9,11 @@
             "extinct": "Extinct"
         }
     },
+    "icons": {
+        "active": "roentgen-stratovolcano___lava",
+        "dormant": "roentgen-stratovolcano___smoke",
+        "extinct": "roentgen-stratovolcano"
+    },
     "autoSuggestions": false,
     "customValues": false
 }

data/fields/volcano/type.json

@@ -9,6 +9,11 @@
             "scoria": "Scoria"
         }
     },
+    "icons": {
+        "stratovolcano": "roentgen-stratovolcano___smoke_2",
+        "shield": "roentgen-shield_volcano___smoke_2",
+        "scoria": "roentgen-volcanic_cone___smoke_2"
+    },
     "autoSuggestions": false,
     "customValues": false
 }