Feature: Create a compat.py for correct PY3 support and implement it

[udiboy1209]

If buildozer is to work on Py3, such a file is required.

We can just use this file from kivy: https://github.com/kivy/kivy/blob/master/kivy/compat.py

But implementing it will require replacing current code to use compat.

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[dessant]

It can be started by just adding the file, and using it where we have discussed in the other pr, all the changes doesn't have to happen at once.

[udiboy1209]

There currently might be a lot of bugs in buildozer when run in py3. Atleast getting it working in py3 under some condition is required I guess. Then addressing bugs one at a time will be possible, else no one will be able to test correctly.

[dessant]

Are you suggesting that #293 should not use compat now because there may be other bugs in other places where using compat would be the right option?

[dessant]

The compat file can be added in a separate pr, then you can update #293, if mixing them is your main concern.

[udiboy1209]

Mixing the pr s was a concern, but my main concern is not being able to test it until other bugs(such as the one I posted another issue about) are resolved. Probably I should rename this issue to "support py3" :P.

[udiboy1209]

There's another issue regarding supporting py3 #175.

[AndreMiras]

Python3 is now supported