[TIMOB-25688] parity for android for the fontWeight of fonts

According to appcelerator docs for the fontWeights property of font there are available values like "semibold", "thin", "light", "ultralight" but these can be used only on iOS so what I need is to make them available on android also. https://docs.appcelerator.com/platform/latest/#!/api/Font here is the code with which you can test different fontWeights var win = Ti.UI.createWindow({ backgroundColor: 'white', exitOnClose: true, fullscreen: false, layout: 'vertical', title: 'Label Demo' }); var normal = Ti.UI.createLabel({ color: 'black', font: { fontSize : 40, fontWeight : 'normal' }, text: 'A simple label' }); var bold = Ti.UI.createLabel({ color: 'black', font: { fontSize : 40, fontWeight : 'bold' }, text: 'A simple label' }); win.add(normal); win.add(bold); win.open();