build: use app-id to determine installed icon

This means we don't install org.gnome.Sysprof.svg anymore when building
with -Ddevelopment=true (and vice versa). We do use org.gnome.Sysprof.svg
from libsysprof-ui, but that embeds the appropriate resources.

data/icons/meson.build

@@ -0,0 +1,7 @@
+icondir = join_paths(datadir, 'icons/hicolor')
+
+foreach kind: ['scalable', 'symbolic']
+  install_subdir(kind, install_dir: icondir)
+endforeach
+
+install_data('@0@.svg'.format(app_id), install_dir: join_paths(icondir, 'scalable/apps'))

data/meson.build

@@ -30,11 +30,5 @@ if get_option('gtk') and get_option('libsysprof')
       install_dir: join_paths(datadir, 'applications')
   )
 
-  icon_sizes = ['scalable', 'symbolic']
-  foreach size: icon_sizes
-    install_subdir('icons/' + size,
-      install_dir: join_paths(datadir, 'icons/hicolor')
-    )
-  endforeach
-
+  subdir('icons')
 endif

src/libsysprof-ui/libsysprof-ui.gresource.xml

@@ -5,7 +5,7 @@
     <file compressed="true">css/SysprofDisplay-shared.css</file>
 
     <!-- Application icons -->
-    <file alias="icons/scalable/apps/org.gnome.Sysprof.svg">../../data/icons/scalable/apps/org.gnome.Sysprof.svg</file>
+    <file alias="icons/scalable/apps/org.gnome.Sysprof.svg">../../data/icons/org.gnome.Sysprof.svg</file>
     <file alias="icons/scalable/apps/org.gnome.Sysprof-symbolic.svg">../../data/icons/symbolic/apps/org.gnome.Sysprof-symbolic.svg</file>
     <file alias="icons/symbolic/apps/org.gnome.Sysprof-symbolic.svg">../../data/icons/symbolic/apps/org.gnome.Sysprof-symbolic.svg</file>
   </gresource>