bug1056857-Part 1: added developer checkbox for ignoring GPS. r=ehung

This is just the GUI side, the other parts of this bug are implementation of this.
Bug 1058547 - Amount about balance is cut
Bug 990047 - Add a shared function to load JSON files and use it throughout gaia to replace the existing ad-hoc functions
Bug 1058555 - Updating preloaded apps in FOTA/OTA results in duplicate apps in /data/local/webapps r=gduan
Bug 1055104 - Theme switching panel

This patch adds a Theme switching panel in the Settings app.
Bug 1061118 - Dismiss keyboard on attention window requestopen or recovering
Bug 1058330 - Use the 'geolocation-noprompt' permission in Find My Device r=mgoodwin
Bug 1055446 - NFC: log visibly errors in nfc related files, r=gweng
Bug 1060403 - [NFC] Add src: nfc property to activities launched from NfcManager, so app developers can use it for filtering, r=gweng
Bug 947352 - [B2G][Contacts] Magnifying glass search icon on scroll list in contacts app does not function
Bug 1045662 - List all possible strings for easier localization
Bug 1060274 - Fix l10n issues of apn settings
 Bug 934209 - support multi-row for key popup.

1. To address UI review comments about the interaction.
   - Enlarge the menu lock area.
   - Keep to select the last/first element when moving out of the menu
     edge.
2. Fix the vertical position for landscape mode.

3. Code review comments
 - Update the naming of menu view
 - Refine the menu related instances that manager holds
 - Fix integration test and unit tests.

4. UI - To address UI review comment for edge case.
Bug 1061441 - [Vertical Home] Long bookmark name appears as partly cut from right side
Bug 1061042 - Add the icon for EU roaming
Bug 1053703 - Merge pre-app.js, app.js and post-app.js to one javascript file r=gduan
Bug 942309 - [keyboard] keyboard layout language changes for input type=url and type=email
Bug 1061437 - Revert the patches of embedding BT app in settings app
Bug 1061012 - Fixing the callscreen window visibility and preventing the creation of an audio context at preload.
Bug 1059224 - [v2.1] Update browser launch method to use manifest url instead of app name