Add Playground Equipment preset category (close #56)

Add `playground=playhouse` preset (which has >1000 uses, more than some existing `playground` presets)
Fix the filenames of playground presets to match their tags

data/preset_categories/playground.json

@@ -0,0 +1,17 @@
+{
+    "icon": "temaki-play_structure",
+    "name": "Playground Equipment",
+    "members": [
+        "playground/swing",
+        "playground/structure",
+        "playground/slide",
+        "playground/sandpit",
+        "playground/springy",
+        "playground/climbingframe",
+        "playground/seesaw",
+        "playground/roundabout",
+        "playground/zipwire",
+        "playground/basketswing",
+        "playground/playhouse"
+    ]
+}

data/presets/playground/playhouse.json

@@ -0,0 +1,17 @@
+{
+    "icon": "temaki-play_structure",
+    "geometry": [
+        "point",
+        "area"
+    ],
+    "tags": {
+        "playground": "playhouse"
+    },
+    "terms": [
+        "children's house",
+        "playground house",
+        "playhouse",
+        "Wendy house"
+    ],
+    "name": "Play House"
+}

interim/source_strings.yaml

@@ -13,6 +13,8 @@ en:
         name: Natural Features
       category-path:
         name: Paths
+      category-playground:
+        name: Playground Equipment
       category-rail:
         name: Rails
       category-restriction:
@@ -7352,20 +7354,20 @@ en:
       playground:
         # playground=*
         name: Playground Equipment
-      playground/balance_beam:
+      playground/balancebeam:
         # playground=balancebeam
         name: Play Balance Beam
         terms: '<translate with synonyms or related terms for ''Play Balance Beam'', separated by commas>'
-      playground/basket_spinner:
+      playground/basketrotator:
         # playground=basketrotator
         name: Basket Spinner
         # 'terms: basket rotator'
         terms: '<translate with synonyms or related terms for ''Basket Spinner'', separated by commas>'
-      playground/basket_swing:
+      playground/basketswing:
         # playground=basketswing
         name: Basket Swing
         terms: '<translate with synonyms or related terms for ''Basket Swing'', separated by commas>'
-      playground/climbing_frame:
+      playground/climbingframe:
         # playground=climbingframe
         name: Play Climbing Frame
         # 'terms: jungle gym,monkey bars'
@@ -7379,11 +7381,11 @@ en:
         name: Play Horizontal Bar
         # 'terms: chin-up bar,high bar,pull-up bar'
         terms: '<translate with synonyms or related terms for ''Play Horizontal Bar'', separated by commas>'
-      playground/rocker:
-        # playground=springy
-        name: Spring Rider
-        # 'terms: spring rocker,springy rocker'
-        terms: '<translate with synonyms or related terms for ''Spring Rider'', separated by commas>'
+      playground/playhouse:
+        # playground=playhouse
+        name: Play House
+        # 'terms: children''s house,playground house,playhouse,Wendy house'
+        terms: '<translate with synonyms or related terms for ''Play House'', separated by commas>'
       playground/roundabout:
         # playground=roundabout
         name: Play Roundabout
@@ -7402,6 +7404,11 @@ en:
         # playground=slide
         name: Slide
         terms: '<translate with synonyms or related terms for ''Slide'', separated by commas>'
+      playground/springy:
+        # playground=springy
+        name: Spring Rider
+        # 'terms: spring rocker,springy rocker'
+        terms: '<translate with synonyms or related terms for ''Spring Rider'', separated by commas>'
       playground/structure:
         # playground=structure
         name: Play Structure