Added flatpak build manifests with split dependencies

.gitmodules

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+[submodule "packages/flatpak/shared-modules"]
+	path = packages/flatpak/shared-modules
+	url = https://github.com/flathub/shared-modules.git

packages/flatpak/org.bitmessage.BaseApp.json

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+{
+ "id": "org.bitmessage.BaseApp",
+ "branch": "19.08",
+ "runtime": "org.freedesktop.Platform",
+ "sdk": "org.freedesktop.Sdk",
+ "runtime-version": "19.08",
+ "separate-locales": false,
+ "modules": [
+  "shared-modules/python2.7/python-2.7.json",
+  "shared-modules/qt4/qt4-4.8.7-minimal.json",
+  {
+    "name": "python-sip",
+    "sources": [
+      {
+        "type": "archive",
+        "url": "https://www.riverbankcomputing.com/static/Downloads/sip/4.19.25/sip-4.19.25.tar.gz",
+        "sha256": "b39d93e937647807bac23579edbff25fe46d16213f708370072574ab1f1b4211"
+      }
+    ],
+    "buildsystem": "simple",
+    "build-commands": [
+      "python configure.py --sip-module PyQt4.sip --no-dist-info",
+      "make",
+      "make install"
+    ]
+  },
+  {
+    "name": "python-qt4",
+    "sources": [
+      {
+        "type": "archive",
+        "url": "http://sourceforge.net/projects/pyqt/files/PyQt4/PyQt-4.12.3/PyQt4_gpl_x11-4.12.3.tar.gz",
+        "sha256": "a00f5abef240a7b5852b7924fa5fdf5174569525dc076cd368a566619e56d472"
+      }
+    ],
+    "buildsystem": "simple",
+    "build-commands": [
+      "python configure.py -w --confirm-license",
+      "make",
+      "make install"
+    ]
+  },
+  {
+    "name" : "PyBitmessage-dependencies",
+    "buildsystem" : "simple",
+    "build-options": {
+      "build-args": [
+        "--share=network"
+      ]
+    },
+    "build-commands": [
+      "pip --version",
+      "pip install setuptools msgpack"
+    ]
+  }
+ ]
+}

packages/flatpak/org.bitmessage.PyBitmessage.json

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+{
+    "app-id": "org.bitmessage.PyBitmessage",
+    "runtime": "org.freedesktop.Platform",
+    "runtime-version": "19.08",
+    "branch": "stable",
+    "sdk": "org.freedesktop.Sdk",
+    "base": "org.bitmessage.BaseApp",
+    "command": "pybitmessage",
+    "base-version":"stable",
+    "finish-args" : [
+      "--share=network",
+      "--socket=x11",
+      "--share=ipc",
+      "--filesystem=xdg-config/PyBitmessage:create"
+    ],
+    "modules": [
+      {
+        "name" : "PyBitmessage",
+        "buildsystem" : "simple",
+        "build-options": {
+          "build-args": [
+            "--share=network"
+          ]
+        },
+        "build-commands": [
+          "python --version",
+          "pwd",
+          "ls",
+          "python checkdeps.py",
+          "python setup.py install --prefix=/app --exec-prefix=/app",
+          "sed -i 's~/usr/bin/~/app/bin/~' /app/bin/pybitmessage",
+          "cat /app/bin/pybitmessage",
+          "mv /app/share/applications/pybitmessage.desktop /app/share/applications/org.bitmessage.PyBitmessage.desktop",
+          "sed -i 's~Icon=pybitmessage~Icon=org.bitmessage.PyBitmessage~' /app/share/applications/org.bitmessage.PyBitmessage.desktop",
+          "mv /app/share/icons/hicolor/scalable/apps/pybitmessage.svg /app/share/icons/hicolor/scalable/apps/org.bitmessage.PyBitmessage.svg",
+          "mv /app/share/icons/hicolor/24x24/apps/pybitmessage.png /app/share/icons/hicolor/24x24/apps/org.bitmessage.PyBitmessage.png",
+          "which pybitmessage"
+        ],
+        "sources" : [
+          {
+            "type" : "dir",
+            "path" : "../../"
+          }
+        ]
+      }
+    ]
+  }
+  

packages/flatpak/shared-modules

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+Subproject commit fd4d38328ccb078b88ad4a891807e593ae8de806