Cordova framework integration, Android support, mobile UI & options tab

Cordova integration and android platform :
- Added cordova directory with required config
- Added cordova applications generation in gulpfile
- Added cordova development instructions
- Used cordova plugins to simulate missing chrome api  plugins (chrome.serial and chrome.fileSystem)
- Added cordova clipboard support
- Added android operating system and Cordova gui mode
- Fixed some css and js files to make them working on Android as well as on computers
- Added --skipdep argument to accelerate cordova build (gulp task)
- Added a webview helper to help people to update the webview app of their device

New options tab :
- Added options tab replacing the options dropdown
- Added option to switch between phones UI and computers UI

Mobile interface and global interface improvements :
- Simplified the structure of the header with flex css
- Made headerbar and tab container responsive (compact headerbar and side menu)
- All tabs are adapted to mobile interface (except firmware flasher)
- The servos and adjustments tabs are not fully adapted but are "usable"
- Improved header bar animation
- Improved log expandation animation
- Added swipe gesture to toggle side menu

Fixes during the development :
- Logo position
- Dark mode
- Auto connection
- Error messages (cordova_chromeapi.js)
- Responsive grid
- Testing
- Disconnection
- Width of boxes inside the OSD tab
- Fixed cli tab
- OSD tab
- Motor stop switch
- White spaces in boxes
- Dialogs size
- Connect button state
- Prevent tablet with a height larger than 575px to switch to computers ui
- Fixed logging tab
- Fixed code smell
- Fixed yarn cordova plugin install issue
- Fixed content_wrapper
- Fixed vibrations when scrolling
- Fixed scrolling bar alignment
- Fixed dialogReportProblem height
- Fixed rates logo
- Fixed auto connection default value (true)
- Fixed D to D max
- Fixed dialogs

Added required messages in locales/en/messages.json file

Requested changes

src/js/port_handler.js

@@ -40,7 +40,7 @@ PortHandler.check = function () {
             if (GUI.connected_to) {
                 for (var i = 0; i < removed_ports.length; i++) {
                     if (removed_ports[i] == GUI.connected_to) {
-                        $('div#port-picker a.connect').click();
+                        $('div#header_btns a.connect').click();
                     }
                 }
             }
@@ -116,7 +116,7 @@ PortHandler.check = function () {
                 // we need firmware flasher protection over here
                 if (GUI.active_tab != 'firmware_flasher') {
                     GUI.timeout_add('auto-connect_timeout', function () {
-                        $('div#port-picker a.connect').click();
+                        $('div#header_btns a.connect').click();
                     }, 100); // timeout so bus have time to initialize after being detected by the system
                 }
             }
@@ -164,7 +164,6 @@ PortHandler.check_usb_devices = function (callback) {
             }
             self.dfu_available = false;
         }
-
         if(callback) callback(self.dfu_available);
 
         if (!$('option:selected', portPickerElement).data().isDFU) {