Issue #404 - Create common library shared between plugin/engine and installer

common/common.gypi

+# This file is part of Adblock Plus <https://adblockplus.org/>,
+# Copyright (C) 2006-2015 Eyeo GmbH
+#
+# Adblock Plus is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 3 as
+# published by the Free Software Foundation.
+#
+# Adblock Plus is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ 
+{
+  'targets': [
+    {
+      'target_name': 'common',
+      'type': 'static_library',
+      'include_dirs': [
+        'include',
+      ],
+      'sources': [
+        'include/Registry.h',
+        'src/Registry.cpp',
+        'include/IeVersion.h',
+        'src/IeVersion.cpp',
+      ],
+      'all_dependent_settings': {
+        'include_dirs': [
+          'include',
+        ],
+      },
+    },
+    {
+      'target_name': 'common_tests',
+      'type': 'executable',
+      'dependencies': [
+        'common',
+        'libadblockplus/third_party/googletest.gyp:googletest_main',
+      ],
+      'sources': [
+        'test/RegistryTest.cpp',
+        'test/IeVersionTest.cpp',
+      ],
+      'defines': ['WINVER=0x0501'],
+      'link_settings': {
+        'libraries': ['-ladvapi32', '-lshell32', '-lole32'],
+      },
+      'msvs_settings': {
+        'VCLinkerTool': {
+          'SubSystem': '1',   # Console

[Oleksandr, 2015/03/04 05:26:29]

Nit: No space after #

[sergei, 2015/03/04 08:02:00]

Did you mean "one space before #"? Actually, as I see, we use space after #. But
we usually put comments in gyp files on a separate line before the commented
line.

[Eric, 2015/03/04 14:15:16]

This 'msvs_settings' section is copypasta from the main GYP file
'adblockplus.gyp', where it appears twice.

Is there a need to change this, really?

[Oleksandr, 2015/03/04 15:37:23]

Yes, I actually was meant to say one space _before_ #, sorry. This can be fixed
in adblockplus.gyp sometime later as well. 

[Eric, 2015/03/04 16:55:10]

I fixed all of them. We're already altering adblockplus.gyp; no reason not to do
it now.

+          'EntryPointSymbol': 'mainCRTStartup',
+        },
+      },
+    },
+  ]
+}