fix: convertPointToView() to use "ti.ui.defaultunit"

[jquick-axway]

JIRA:
https://jira.appcelerator.org/browse/TIMOB-27807

Summary:

• Fixes bug where convertPointToView() always returns pixels on Android.
• Fixes bug where convertPointToView() always returns dips on iOS.
• This method now returns the units set by "tiapp.xml" file's ti.ui.defaultunit". (Dips by default.)
• Fixed convertPointToView() to accept x/y point string values with post-fixed units.

Test:

1. Build and run the below code on Android.
2. Attempt to drag one of the squares on screen.
3. Verify square follows your finger. (Square may wobble on Android due to a separate issue.)
4. Build for iOS and repeat steps 2 - 3.
5. In the "tiapp.xml", set the following property to pixels.
   <property name="ti.ui.defaultunit" type="string">px</property>
6. Build for Android and repeat steps 2 -3.
7. Build for iOS and repeat steps 2 -3.

app.js

function createDragSquare(top, left, color) {
	var view = Ti.UI.createView({
		touchEnabled: true,
		backgroundColor: color,
		center: { x: left + 50, y: top + 50 },
		width: 100,
		height: 100,
	});
	view.addEventListener("touchmove", function(event) {
		view.center = view.convertPointToView({ x: event.x, y: event.y }, window);
		event.cancelBubble = true;
	});
	return view;
}

var window = Ti.UI.createWindow({ backgroundColor: "white" });
window.add(createDragSquare(40, 40, "red"));
window.add(createDragSquare(120, 120, "green"));
window.add(createDragSquare(200, 200, "blue"));
window.open();

[build]

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[garymathews]

This PR brings current behaviour inline with iOS. However, I brought up that Point can accept String parameters allowing units to be specified. @jquick-axway found that iOS also did not support this. So either we drop String support, or allow units to be specified.

[jquick-axway]

Updated PR. Now supports x/y string value with units postfixed to it.

[garymathews]

CR: PASS

[ssjsamir]

FR Passed: Tested using the test case mentioned above. Note* As mentioned in the description the Android test case wobbles but this is a separate issue.

Test Environment

MacOS Big Sur: 11.1 Beta 1
Xcode: 12.2 Beta
Java Version: 1.8.0_242
Android NDK: 21.3.6528147
Node.js: 12.18.1
""NPM":"5.0.0","CLI":"8.1.1""
Pixel XL (10.0) Sim

[jquick-axway]

@ssjsamir , the following PR will address that touch drag wobble issue.
#12340