[3.x] Improve touchpad and mouse support for the Android editor

[m4gr3d]

• Fix issues with using a touchpad to click, drag, interact with the navigation controls, etc..
• Fix issues with panning with 2+ fingers
• Fix issues with using double-tap to magnify on the spatial editor

main version

[lawnjelly]

Have been testing by building Android editor, it does seem the 3D controls are better after the PR. In particular the controls were getting stuck in a movement before even though I wasn't touching the 3D controls, this seems fixed after the PR.

I'm seeing some kind of graphical corruption in what appears to be the 3D grid, but that's a separate issue unrelated to the input.

[lawnjelly]

Looks good to me and from testing of the Android Editor.
Admittedly I'm not an expert on the Android java side, but the logic looks sound.

[akien-mga]

Thanks!