[Tizen] Make better split between Tizen and Tizen mobile codebase

There are generic and mobile specific parts of the code that could
be split or shared. This patch enables -Dtizen=1 by default and moves
mobile specific code under tizen_mobile and OS_TIZEN_MOBILE flags.
[Android] Support package file name including space character.

If package file name includes space character, this character
will be replaced with '_', according to the new user requirement,
blank character should be supported, this fix resolves this issue
by removing the space from the invalid characters.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1006
[Android] Temporarily disable CSP support and related test.

A known issue was found in the common code of csp implementation
both for Android and Tizen, so disable the bridge code in android
until the issue was fixed.

bug=https://crosswalk-project.org/jira/browse/XWALK-1022
[Android] Fix the issue onPageFinished callback would be called twice

This commit contains the following changes:

o Only rely on didStopLoading to call onPageFinished callback. Generally, both
  didStopLoading and didFinishLoad callbacks are the same except
  1) didStopLoading will also be called for extended protocols, like mailto:,
     tel: etc;
  2) didStopLoading will be called if user clicks "X" button on the browser UI.

o Loading javascript: URL should not cause onPageFinished calling since it is
  assumed that javascript: url is executed in an existing JS context in a web
  page already loaded.

o Port some test cases from android_webview/ for onPageFinished test.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1017
TEST=org.xwalk.core.xwview.test.XWalkClientOnPageFinishedTest
Merge pull request #1605 from alexshalamov/split_mobile_and_generic_tizen

[Tizen] Make better split between Tizen and Tizen mobile codebase
Merge pull request #1619 from gaochun/csp2

[Android] Temporarily disable CSP support and related test.
Merge pull request #1610 from hmin/duplicated-onpagefinished

[Android] Fix the issue onPageFinished callback would be called twice
Merge pull request #1602 from ShDavidliu/UpdatePackageName

[Android] Support package file name including space character.
[Runtime] Separate WGT application manifest handling from XPK applications.

When loading WGT manifest file, current Crosswalk maps XML Widget
elements to manifest keys under namespace 'application_manifest_keys' by
hard code. Consequently, WGT app and XPK app share the same manifest
keys and manifest handlers. As with more manifest keys and handlers are
introduced for WGT app, this causes a mix up of WGT specific keys and
XPK specific keys, due to WGT and XPK app have different manifest formats
and keys, especially put Tizen Extending Configuration Elements into
consideration.

A solution to fix above issue is to separate WGT manifest keys and handlers
from XPK apps. In detail, when loading WGT manifest, we introduce a
mechanism to save XML configuration information into manifest Dictionary
structure(note that this is not hard code mapping), keys are different
from those of XPK apps. WGT keys are put under 'application_widget_keys'
namespace, while XPK keys are put under 'application_manifest_keys'.
Then we could add WGT specific handlers for WGT keys.