Remove libhandy git submodule, bump minimum version to 0.10

Fixes Flatpak CI FTB, distros are all packaging it anyway.

.gitmodules

@@ -1,3 +0,0 @@
-[submodule "subprojects/libhandy"]
-	path = subprojects/libhandy
-	url = https://source.puri.sm/Librem5/libhandy.git

meson.build

@@ -79,7 +79,7 @@ gthread = dependency('gthread-2.0', version: '>=' + target_glib)
 iso_codes = dependency('iso-codes')
 javascriptcoregtk = dependency('javascriptcoregtk-4.0', version: '>=' + target_webkit)
 json_glib = dependency('json-glib-1.0', version: '>= 1.0')
-libhandy = dependency('libhandy-0.0', version: '>= 0.0.9', required: false)
+libhandy = dependency('libhandy-0.0', version: '>= 0.0.10')
 libmath = cc.find_library('m')
 libpeas = dependency('libpeas-1.0', version: '>= 1.24.0')
 libsecret = dependency('libsecret-1', version: '>= 0.11')
@@ -100,26 +100,6 @@ if not enchant.found()
   enchant = dependency('enchant', version: '>=1.6')
 endif
 
-# Handy isn't necessarily packaged by distros, so fall back to a
-# subproject until it is.
-if not libhandy.found()
-  libhandy_subproj = subproject(
-    'libhandy',
-    default_options: [
-      'examples=false',
-      'glade_catalog=disabled',
-      'tests=false',
-    ]
-  )
-
-  libhandy = declare_dependency(
-    dependencies: [
-      libhandy_subproj.get_variable('libhandy_dep'),
-      libhandy_subproj.get_variable('libhandy_vapi'),
-    ]
-  )
-endif
-
 # Libunwind system dependencies above ensures appropriate versions,
 # but this declared depencency is what we actually build against so we
 # can include the custom VAPI correctly. We need to add unwind_lib to

org.gnome.Geary.json

@@ -180,7 +180,8 @@
             "sources": [
                 {
                     "type": "git",
-                    "url": "https://source.puri.sm/Librem5/libhandy.git"
+                    "url": "https://source.puri.sm/Librem5/libhandy.git",
+                    "branch": "v0.0.13"
                 }
             ]
         },

org.gnome.Geary.yml

@@ -184,6 +184,7 @@ modules:
     sources:
       - type: git
         url: https://source.puri.sm/Librem5/libhandy.git
+        branch: v0.0.13
 
   # Geary dependency
   - name: libpeas

subprojects/libhandy

@@ -1 +0,0 @@
-Subproject commit b6ff87ea07c69171aa7c743d8c2740527b525271