[Primary] Adapt gesture listeners to cope with new width/height fontSize handling

[mzorz]

As part of tackling #153, #205, #66 and probably #180, we're changing the pinch to zoom behavior to change the TextView's fontSize to the extent it's applicable, and then only manipulate the View's scale when fontSize has already reached a limit.

This is applicable to views based on TextView (emoji and text), but is not applicable to views based on ImageView(animated gif and such).

For this, several things need be done:
PART 1:

• use some way to change fontSize when resizing the View (Pinch to zoom TextView handling - part 1 #204)

PART 2:

• set a maximum to avoid this
  2019-11-22 09:11:14.763 9332-9378/com.automattic.portkey E/OpenGLRenderer: Font size too large to fit in cache. width, height = 359, 338 (Sets default maximum font size for emoji to 112sp #206)

PART 3:

• scale / rotate: either reconnect the old listener and use scale / rotate as well, or implement rotation on the new simplified listener ([DO NOT MERGE] Detecting rotation gesture (AutoResizeTextView-based scaling refactor part 2) #208)
• re-implement the "delete view" in the new listener [DO NOT MERGE] TextViewSizeAwareTouchListener deleteView behavior support (scaling refactor part 3) #209
• make sure all the pre-existing functionality works as expected [DO NOT MERGE] Using TextViewSizeAwareTouchListener with Text views (scaling refactor part 4) #210 (re-wiring Text handling)

PART 4:

• add a callback interface on AutoResizeTextView to let the listener know when the maximum / minimum font size has been reached, so the gesture detector can stop sending shrink/zoom signals to the view (if minimum reached), or switch to SCALING change when the maximum FontSize has been reached. See [DO NOT MERGE] Introduce OnMaxMinFontSizeReached listener (scaling refactor part 5) #211 and [DON'T MERGE] fontSize/scale handler switch management (scaling refactor part 6 - final) #214

PART 5:

• evaluate whether it makes sense to handle ImageView separately with the old, pre-existing listeners (could potentially be a step in the meantime), or incorporate the scale listener mechanism within the new listener scheme (in which case, we should remove the old classes if they end up not being used). EDIT: added handling of images with the new listener in 926b3ce in [DO NOT MERGE] Using TextViewSizeAwareTouchListener with Text views (scaling refactor part 4) #210

[mzorz]

As explained in #153 (comment), closing this issue as won't fix, given the approach wasn't as fruitful as I thought after all